[{"abstract":[{"text":"Nonanalytic points in the return probability of a quantum state as a function of time, known as dynamical quantum phase transitions (DQPTs), have received great attention in recent years, but the understanding of their mechanism is still incomplete. In our recent work [Phys. Rev. Lett. 126, 040602 (2021)], we demonstrated that one-dimensional DQPTs can be produced by two distinct mechanisms, namely semiclassical precession and entanglement generation, leading to the definition of precession (pDQPTs) and entanglement (eDQPTs) dynamical quantum phase transitions. In this manuscript, we extend and investigate the notion of p- and eDQPTs in two-dimensional systems by considering semi-infinite ladders of varying width. For square lattices, we find that pDQPTs and eDQPTs persist and are characterized by similar phenomenology as in 1D: pDQPTs are associated with a magnetization sign change and a wide entanglement gap, while eDQPTs correspond to suppressed local observables and avoided crossings in the entanglement spectrum. However, DQPTs show higher sensitivity to the ladder width and other details, challenging the extrapolation to the thermodynamic limit especially for eDQPTs. Moving to honeycomb lattices, we also demonstrate that lattices with an odd number of nearest neighbors give rise to phenomenologies beyond the one-dimensional classification.","lang":"eng"}],"type":"journal_article","oa_version":"Preprint","_id":"11337","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","title":"Entanglement and precession in two-dimensional dynamical quantum phase transitions","status":"public","intvolume":" 105","day":"15","article_processing_charge":"No","date_published":"2022-04-15T00:00:00Z","publication":"Physical Review B","citation":{"ista":"De Nicola S, Michailidis A, Serbyn M. 2022. Entanglement and precession in two-dimensional dynamical quantum phase transitions. Physical Review B. 105, 165149.","ieee":"S. De Nicola, A. Michailidis, and M. Serbyn, “Entanglement and precession in two-dimensional dynamical quantum phase transitions,” Physical Review B, vol. 105. American Physical Society, 2022.","apa":"De Nicola, S., Michailidis, A., & Serbyn, M. (2022). Entanglement and precession in two-dimensional dynamical quantum phase transitions. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.105.165149","ama":"De Nicola S, Michailidis A, Serbyn M. Entanglement and precession in two-dimensional dynamical quantum phase transitions. Physical Review B. 2022;105. doi:10.1103/PhysRevB.105.165149","chicago":"De Nicola, Stefano, Alexios Michailidis, and Maksym Serbyn. “Entanglement and Precession in Two-Dimensional Dynamical Quantum Phase Transitions.” Physical Review B. American Physical Society, 2022. https://doi.org/10.1103/PhysRevB.105.165149.","mla":"De Nicola, Stefano, et al. “Entanglement and Precession in Two-Dimensional Dynamical Quantum Phase Transitions.” Physical Review B, vol. 105, 165149, American Physical Society, 2022, doi:10.1103/PhysRevB.105.165149.","short":"S. De Nicola, A. Michailidis, M. Serbyn, Physical Review B 105 (2022)."},"article_type":"original","ec_funded":1,"article_number":"165149","author":[{"full_name":"De Nicola, Stefano","first_name":"Stefano","last_name":"De Nicola","id":"42832B76-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-4842-6671"},{"full_name":"Michailidis, Alexios","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","last_name":"Michailidis","first_name":"Alexios"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827","first_name":"Maksym","last_name":"Serbyn","full_name":"Serbyn, Maksym"}],"date_updated":"2023-08-03T06:33:33Z","date_created":"2022-04-28T08:06:10Z","volume":105,"year":"2022","acknowledgement":"We acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 850899).\r\nS.D.N. also acknowledges funding from the Institute of Science and Technology (IST) Austria, and from the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Skłodowska-Curie Grant Agreement No. 754411.","publication_status":"published","publisher":"American Physical Society","department":[{"_id":"MaSe"}],"month":"04","publication_identifier":{"eisbn":["2469-9969"],"issn":["2469-9950"]},"doi":"10.1103/PhysRevB.105.165149","language":[{"iso":"eng"}],"oa":1,"external_id":{"arxiv":["2112.11273"],"isi":["000806812400004"]},"main_file_link":[{"url":" https://doi.org/10.48550/arXiv.2112.11273","open_access":"1"}],"isi":1,"quality_controlled":"1","project":[{"grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"},{"name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425"}]},{"month":"06","publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"doi":"10.1103/physrevb.105.224208","acknowledged_ssus":[{"_id":"ScienComp"}],"language":[{"iso":"eng"}],"external_id":{"arxiv":["2111.08603"],"isi":["000823050000001"]},"main_file_link":[{"url":" https://doi.org/10.48550/arXiv.2111.08603 Focus to learn more","open_access":"1"}],"oa":1,"isi":1,"quality_controlled":"1","project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020"}],"ec_funded":1,"article_number":"224208","author":[{"full_name":"Brighi, Pietro","last_name":"Brighi","first_name":"Pietro","orcid":"0000-0002-7969-2729","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Alexios","last_name":"Michailidis","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-8443-1064","full_name":"Michailidis, Alexios"},{"id":"4aeda2ae-f847-11ec-98e0-c4a66fe174d4","last_name":"Kirova","first_name":"Kristina","full_name":"Kirova, Kristina"},{"full_name":"Abanin, Dmitry A.","last_name":"Abanin","first_name":"Dmitry A."},{"orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","first_name":"Maksym","full_name":"Serbyn, Maksym"}],"related_material":{"record":[{"status":"public","relation":"dissertation_contains","id":"12732"}]},"date_updated":"2023-09-05T12:12:52Z","date_created":"2022-06-29T20:19:51Z","volume":105,"year":"2022","acknowledgement":"We thank M. Ljubotina for insightful discussions. P. B., A. M. and M. S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). D. A. was supported by the Swiss National Science Foundation and by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 864597). The development of parallel TEBD code was supported by S. Elefante from the Scientific Computing (SciComp) that is part of Scientific Service Units (SSU) of IST Austria. Some of the computations were performed on the Baobab cluster of the University of Geneva.","publication_status":"published","publisher":"American Physical Society","department":[{"_id":"MaSe"}],"day":"27","article_processing_charge":"No","date_published":"2022-06-27T00:00:00Z","publication":"Physical Review B","citation":{"chicago":"Brighi, Pietro, Alexios Michailidis, Kristina Kirova, Dmitry A. Abanin, and Maksym Serbyn. “Localization of a Mobile Impurity Interacting with an Anderson Insulator.” Physical Review B. American Physical Society, 2022. https://doi.org/10.1103/physrevb.105.224208.","short":"P. Brighi, A. Michailidis, K. Kirova, D.A. Abanin, M. Serbyn, Physical Review B 105 (2022).","mla":"Brighi, Pietro, et al. “Localization of a Mobile Impurity Interacting with an Anderson Insulator.” Physical Review B, vol. 105, no. 22, 224208, American Physical Society, 2022, doi:10.1103/physrevb.105.224208.","ieee":"P. Brighi, A. Michailidis, K. Kirova, D. A. Abanin, and M. Serbyn, “Localization of a mobile impurity interacting with an Anderson insulator,” Physical Review B, vol. 105, no. 22. American Physical Society, 2022.","apa":"Brighi, P., Michailidis, A., Kirova, K., Abanin, D. A., & Serbyn, M. (2022). Localization of a mobile impurity interacting with an Anderson insulator. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.105.224208","ista":"Brighi P, Michailidis A, Kirova K, Abanin DA, Serbyn M. 2022. Localization of a mobile impurity interacting with an Anderson insulator. Physical Review B. 105(22), 224208.","ama":"Brighi P, Michailidis A, Kirova K, Abanin DA, Serbyn M. Localization of a mobile impurity interacting with an Anderson insulator. Physical Review B. 2022;105(22). doi:10.1103/physrevb.105.224208"},"article_type":"original","abstract":[{"lang":"eng","text":"Thermalizing and localized many-body quantum systems present two distinct dynamical phases of matter. Recently the fate of a localized system coupled to a thermalizing system viewed as a quantum bath received significant theoretical and experimental attention. In this work, we study a mobile impurity, representing a small quantum bath, that interacts locally with an Anderson insulator with a finite density of localized particles. Using static Hartree approximation to obtain an effective disorder strength, we formulate an analytic criterion for the perturbative stability of the localization. Next, we use an approximate dynamical Hartree method and the quasi-exact time-evolved block decimation (TEBD) algorithm to study the dynamics of the system. We find that the dynamical Hartree approach which completely ignores entanglement between the impurity and localized particles predicts the delocalization of the system. In contrast, the full numerical simulation of the unitary dynamics with TEBD suggests the stability of localization on numerically accessible timescales. Finally, using an extension of the density matrix renormalization group algorithm to excited states (DMRG-X), we approximate the highly excited eigenstates of the system. We find that the impurity remains localized in the eigenstates and entanglement is enhanced in a finite region around the position of the impurity, confirming the dynamical predictions. Dynamics and the DMRG-X results provide compelling evidence for the stability of localization."}],"issue":"22","type":"journal_article","oa_version":"Preprint","_id":"11469","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","title":"Localization of a mobile impurity interacting with an Anderson insulator","status":"public","intvolume":" 105"},{"publication_identifier":{"issn":["2691-3399"]},"month":"06","project":[{"grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020"}],"quality_controlled":"1","isi":1,"external_id":{"arxiv":["2201.08194"],"isi":["000822564300001"]},"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png"},"oa":1,"language":[{"iso":"eng"}],"doi":"10.1103/prxquantum.3.020365","article_number":"020365","ec_funded":1,"file_date_updated":"2022-06-30T07:14:48Z","department":[{"_id":"MaSe"}],"publisher":"American Physical Society","publication_status":"published","year":"2022","acknowledgement":"We thank Marco Cerezo, Zoe Holmes, and Nicholas Hunter-Jones for fruitful discussion and valuable feedback. We also acknowledge Adam Smith, Johannes Jakob Meyer, and Victor V. Albert for comments on the paper. The simulations were performed in the Julia programming\r\nlanguage [65] using the Yao module [66]. S.H.S., R.A.M., A.A.M. and M.S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899).","volume":3,"date_created":"2022-06-29T20:21:32Z","date_updated":"2023-12-13T14:47:24Z","related_material":{"record":[{"relation":"dissertation_contains","status":"public","id":"14622"}]},"author":[{"last_name":"Sack","first_name":"Stefan","orcid":"0000-0001-5400-8508","id":"dd622248-f6e0-11ea-865d-ce382a1c81a5","full_name":"Sack, Stefan"},{"full_name":"Medina Ramos, Raimel A","last_name":"Medina Ramos","first_name":"Raimel A","orcid":"0000-0002-5383-2869","id":"CE680B90-D85A-11E9-B684-C920E6697425"},{"full_name":"Michailidis, Alexios","orcid":"0000-0002-8443-1064","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","last_name":"Michailidis","first_name":"Alexios"},{"last_name":"Kueng","first_name":"Richard","full_name":"Kueng, Richard"},{"full_name":"Serbyn, Maksym","last_name":"Serbyn","first_name":"Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"}],"keyword":["General Medicine"],"article_processing_charge":"No","has_accepted_license":"1","day":"29","article_type":"original","citation":{"chicago":"Sack, Stefan, Raimel A Medina Ramos, Alexios Michailidis, Richard Kueng, and Maksym Serbyn. “Avoiding Barren Plateaus Using Classical Shadows.” PRX Quantum. American Physical Society, 2022. https://doi.org/10.1103/prxquantum.3.020365.","mla":"Sack, Stefan, et al. “Avoiding Barren Plateaus Using Classical Shadows.” PRX Quantum, vol. 3, no. 2, 020365, American Physical Society, 2022, doi:10.1103/prxquantum.3.020365.","short":"S. Sack, R.A. Medina Ramos, A. Michailidis, R. Kueng, M. Serbyn, PRX Quantum 3 (2022).","ista":"Sack S, Medina Ramos RA, Michailidis A, Kueng R, Serbyn M. 2022. Avoiding barren plateaus using classical shadows. PRX Quantum. 3(2), 020365.","apa":"Sack, S., Medina Ramos, R. A., Michailidis, A., Kueng, R., & Serbyn, M. (2022). Avoiding barren plateaus using classical shadows. PRX Quantum. American Physical Society. https://doi.org/10.1103/prxquantum.3.020365","ieee":"S. Sack, R. A. Medina Ramos, A. Michailidis, R. Kueng, and M. Serbyn, “Avoiding barren plateaus using classical shadows,” PRX Quantum, vol. 3, no. 2. American Physical Society, 2022.","ama":"Sack S, Medina Ramos RA, Michailidis A, Kueng R, Serbyn M. Avoiding barren plateaus using classical shadows. PRX Quantum. 2022;3(2). doi:10.1103/prxquantum.3.020365"},"publication":"PRX Quantum","date_published":"2022-06-29T00:00:00Z","type":"journal_article","issue":"2","abstract":[{"text":"Variational quantum algorithms are promising algorithms for achieving quantum advantage on nearterm devices. The quantum hardware is used to implement a variational wave function and measure observables, whereas the classical computer is used to store and update the variational parameters. The optimization landscape of expressive variational ansätze is however dominated by large regions in parameter space, known as barren plateaus, with vanishing gradients, which prevents efficient optimization. In this work we propose a general algorithm to avoid barren plateaus in the initialization and throughout the optimization. To this end we define a notion of weak barren plateaus (WBPs) based on the entropies of local reduced density matrices. The presence of WBPs can be efficiently quantified using recently introduced shadow tomography of the quantum state with a classical computer. We demonstrate that avoidance of WBPs suffices to ensure sizable gradients in the initialization. In addition, we demonstrate that decreasing the gradient step size, guided by the entropies allows WBPs to be avoided during the optimization process. This paves the way for efficient barren plateau-free optimization on near-term devices. ","lang":"eng"}],"intvolume":" 3","title":"Avoiding barren plateaus using classical shadows","status":"public","ddc":["530"],"_id":"11471","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","file":[{"file_name":"2022_PRXQuantum_Sack.pdf","access_level":"open_access","content_type":"application/pdf","file_size":4231591,"creator":"dernst","relation":"main_file","file_id":"11472","date_updated":"2022-06-30T07:14:48Z","date_created":"2022-06-30T07:14:48Z","checksum":"a7706b28d24a0e32a55ea04b82a2df43","success":1}],"oa_version":"Published Version"},{"month":"03","publication_identifier":{"eissn":["1095-9203"],"issn":["0036-8075"]},"isi":1,"quality_controlled":"1","project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020"}],"oa":1,"external_id":{"isi":["000636043400048"],"pmid":["33632894"],"arxiv":["2012.12276"]},"language":[{"iso":"eng"}],"doi":"10.1126/science.abg2530","file_date_updated":"2021-09-23T14:00:05Z","ec_funded":1,"publication_status":"published","publisher":"AAAS","department":[{"_id":"MaSe"}],"year":"2021","acknowledgement":"We thank many members of the Harvard AMO community, particularly E. Urbach, S. Dakoulas, and J. Doyle for their efforts enabling safe and productive operation of our laboratories during 2020. We thank D. Abanin, I. Cong, F. Machado, H. Pichler, N. Yao, B. Ye, and H. Zhou for stimulating discussions. Funding: We acknowledge financial support from the Center for Ultracold Atoms, the National Science Foundation, the Vannevar Bush Faculty Fellowship, the U.S. Department of Energy (LBNL QSA Center and grant no. DE-SC0021013), the Office of Naval Research, the Army Research Office MURI, the DARPA DRINQS program (grant no. D18AC00033), and the DARPA ONISQ program (grant no. W911NF2010021). The authors acknowledge support from the NSF Graduate Research Fellowship Program (grant DGE1745303) and The Fannie and John Hertz Foundation (D.B.); a National Defense Science and Engineering Graduate (NDSEG) fellowship (H.L.); a fellowship from the Max Planck/Harvard Research Center for Quantum Optics (G.S.); Gordon College (T.T.W.); the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement no. 850899) (A.A.M. and M.S.); a Department of Energy Computational Science Graduate Fellowship under award number DE-SC0021110 (N.M.); the Moore Foundation’s EPiQS Initiative grant no. GBMF4306, the NUS Development grant AY2019/2020, and the Stanford Institute of Theoretical Physics (W.W.H.); and the Miller Institute for Basic Research in Science (S.C.). Author contributions: D.B., A.O., H.L., A.K., G.S., S.E., and T.T.W. contributed to the building of the experimental setup, performed the measurements, and analyzed the data. A.A.M., N.M., W.W.H., S.C., and M.S. performed theoretical analysis. All work was supervised by M.G., V.V., and M.D.L. All authors discussed the results and contributed to the manuscript. Competing interests: M.G., V.V., and M.D.L. are co-founders and shareholders of QuEra Computing. A.O. is a shareholder of QuEra Computing. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and the supplementary materials.","pmid":1,"date_created":"2021-06-29T12:04:05Z","date_updated":"2023-08-10T13:57:07Z","volume":371,"author":[{"last_name":"Bluvstein","first_name":"D.","full_name":"Bluvstein, D."},{"first_name":"A.","last_name":"Omran","full_name":"Omran, A."},{"full_name":"Levine, H.","first_name":"H.","last_name":"Levine"},{"full_name":"Keesling, A.","first_name":"A.","last_name":"Keesling"},{"full_name":"Semeghini, G.","first_name":"G.","last_name":"Semeghini"},{"full_name":"Ebadi, S.","last_name":"Ebadi","first_name":"S."},{"first_name":"T. T.","last_name":"Wang","full_name":"Wang, T. T."},{"full_name":"Michailidis, Alexios","orcid":"0000-0002-8443-1064","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","last_name":"Michailidis","first_name":"Alexios"},{"full_name":"Maskara, N.","last_name":"Maskara","first_name":"N."},{"full_name":"Ho, W. W.","last_name":"Ho","first_name":"W. W."},{"full_name":"Choi, S.","last_name":"Choi","first_name":"S."},{"last_name":"Serbyn","first_name":"Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym"},{"full_name":"Greiner, M.","first_name":"M.","last_name":"Greiner"},{"full_name":"Vuletić, V.","first_name":"V.","last_name":"Vuletić"},{"last_name":"Lukin","first_name":"M. D.","full_name":"Lukin, M. D."}],"keyword":["Multidisciplinary"],"scopus_import":"1","day":"26","article_processing_charge":"No","has_accepted_license":"1","article_type":"original","page":"1355-1359","publication":"Science","citation":{"chicago":"Bluvstein, D., A. Omran, H. Levine, A. Keesling, G. Semeghini, S. Ebadi, T. T. Wang, et al. “Controlling Quantum Many-Body Dynamics in Driven Rydberg Atom Arrays.” Science. AAAS, 2021. https://doi.org/10.1126/science.abg2530.","short":"D. Bluvstein, A. Omran, H. Levine, A. Keesling, G. Semeghini, S. Ebadi, T.T. Wang, A. Michailidis, N. Maskara, W.W. Ho, S. Choi, M. Serbyn, M. Greiner, V. Vuletić, M.D. Lukin, Science 371 (2021) 1355–1359.","mla":"Bluvstein, D., et al. “Controlling Quantum Many-Body Dynamics in Driven Rydberg Atom Arrays.” Science, vol. 371, no. 6536, AAAS, 2021, pp. 1355–59, doi:10.1126/science.abg2530.","apa":"Bluvstein, D., Omran, A., Levine, H., Keesling, A., Semeghini, G., Ebadi, S., … Lukin, M. D. (2021). Controlling quantum many-body dynamics in driven Rydberg atom arrays. Science. AAAS. https://doi.org/10.1126/science.abg2530","ieee":"D. Bluvstein et al., “Controlling quantum many-body dynamics in driven Rydberg atom arrays,” Science, vol. 371, no. 6536. AAAS, pp. 1355–1359, 2021.","ista":"Bluvstein D, Omran A, Levine H, Keesling A, Semeghini G, Ebadi S, Wang TT, Michailidis A, Maskara N, Ho WW, Choi S, Serbyn M, Greiner M, Vuletić V, Lukin MD. 2021. Controlling quantum many-body dynamics in driven Rydberg atom arrays. Science. 371(6536), 1355–1359.","ama":"Bluvstein D, Omran A, Levine H, et al. Controlling quantum many-body dynamics in driven Rydberg atom arrays. Science. 2021;371(6536):1355-1359. doi:10.1126/science.abg2530"},"date_published":"2021-03-26T00:00:00Z","type":"journal_article","abstract":[{"lang":"eng","text":"The control of nonequilibrium quantum dynamics in many-body systems is challenging because interactions typically lead to thermalization and a chaotic spreading throughout Hilbert space. We investigate nonequilibrium dynamics after rapid quenches in a many-body system composed of 3 to 200 strongly interacting qubits in one and two spatial dimensions. Using a programmable quantum simulator based on Rydberg atom arrays, we show that coherent revivals associated with so-called quantum many-body scars can be stabilized by periodic driving, which generates a robust subharmonic response akin to discrete time-crystalline order. We map Hilbert space dynamics, geometry dependence, phase diagrams, and system-size dependence of this emergent phenomenon, demonstrating new ways to steer complex dynamics in many-body systems and enabling potential applications in quantum information science."}],"issue":"6536","title":"Controlling quantum many-body dynamics in driven Rydberg atom arrays","status":"public","ddc":["539"],"intvolume":" 371","_id":"9618","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","oa_version":"Preprint","file":[{"relation":"main_file","file_id":"10040","date_updated":"2021-09-23T14:00:05Z","date_created":"2021-09-23T14:00:05Z","checksum":"0b356fd10ab9bb95177d4c047d4e9c1a","success":1,"file_name":"scars_subharmonic_combined_manuscript_2_11_2021 (2)-1.pdf","access_level":"open_access","content_type":"application/pdf","file_size":3671159,"creator":"patrickd"}]},{"day":"06","has_accepted_license":"1","article_processing_charge":"Yes (in subscription journal)","date_published":"2021-08-06T00:00:00Z","article_type":"letter_note","publication":"Physical Review Letters","citation":{"chicago":"Karle, Volker, Maksym Serbyn, and Alexios Michailidis. “Area-Law Entangled Eigenstates from Nullspaces of Local Hamiltonians.” Physical Review Letters. American Physical Society, 2021. https://doi.org/10.1103/physrevlett.127.060602.","short":"V. Karle, M. Serbyn, A. Michailidis, Physical Review Letters 127 (2021).","mla":"Karle, Volker, et al. “Area-Law Entangled Eigenstates from Nullspaces of Local Hamiltonians.” Physical Review Letters, vol. 127, no. 6, 060602, American Physical Society, 2021, doi:10.1103/physrevlett.127.060602.","ieee":"V. Karle, M. Serbyn, and A. Michailidis, “Area-law entangled eigenstates from nullspaces of local Hamiltonians,” Physical Review Letters, vol. 127, no. 6. American Physical Society, 2021.","apa":"Karle, V., Serbyn, M., & Michailidis, A. (2021). Area-law entangled eigenstates from nullspaces of local Hamiltonians. Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.127.060602","ista":"Karle V, Serbyn M, Michailidis A. 2021. Area-law entangled eigenstates from nullspaces of local Hamiltonians. Physical Review Letters. 127(6), 060602.","ama":"Karle V, Serbyn M, Michailidis A. Area-law entangled eigenstates from nullspaces of local Hamiltonians. Physical Review Letters. 2021;127(6). doi:10.1103/physrevlett.127.060602"},"abstract":[{"text":"Eigenstate thermalization in quantum many-body systems implies that eigenstates at high energy are similar to random vectors. Identifying systems where at least some eigenstates are nonthermal is an outstanding question. In this Letter we show that interacting quantum models that have a nullspace—a degenerate subspace of eigenstates at zero energy (zero modes), which corresponds to infinite temperature, provide a route to nonthermal eigenstates. We analytically show the existence of a zero mode which can be represented as a matrix product state for a certain class of local Hamiltonians. In the more general case we use a subspace disentangling algorithm to generate an orthogonal basis of zero modes characterized by increasing entanglement entropy. We show evidence for an area-law entanglement scaling of the least-entangled zero mode in the broad parameter regime, leading to a conjecture that all local Hamiltonians with the nullspace feature zero modes with area-law entanglement scaling and, as such, break the strong thermalization hypothesis. Finally, we find zero modes in constrained models and propose a setup for observing their experimental signatures.","lang":"eng"}],"issue":"6","type":"journal_article","file":[{"access_level":"open_access","file_name":"PhysRevLett.127.060602_SOM.pdf","file_size":5064231,"content_type":"application/pdf","creator":"mserbyn","relation":"main_file","file_id":"9904","checksum":"51218f302dcef99d90d1209809fcc874","success":1,"date_created":"2021-08-13T09:28:08Z","date_updated":"2021-08-13T09:28:08Z"}],"oa_version":"Published Version","title":"Area-law entangled eigenstates from nullspaces of local Hamiltonians","status":"public","ddc":["539"],"intvolume":" 127","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","_id":"9903","month":"08","publication_identifier":{"eissn":["1079-7114"],"issn":["0031-9007"]},"language":[{"iso":"eng"}],"doi":"10.1103/physrevlett.127.060602","quality_controlled":"1","isi":1,"project":[{"grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020"}],"oa":1,"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png"},"external_id":{"arxiv":["2102.13633"],"isi":["000684276000002"]},"file_date_updated":"2021-08-13T09:28:08Z","ec_funded":1,"article_number":"060602","date_updated":"2023-08-11T10:43:27Z","date_created":"2021-08-13T09:27:39Z","volume":127,"author":[{"first_name":"Volker","last_name":"Karle","id":"D7C012AE-D7ED-11E9-95E8-1EC5E5697425","orcid":"0000-0002-6963-0129","full_name":"Karle, Volker"},{"full_name":"Serbyn, Maksym","last_name":"Serbyn","first_name":"Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Michailidis, Alexios","orcid":"0000-0002-8443-1064","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","last_name":"Michailidis","first_name":"Alexios"}],"publication_status":"published","publisher":"American Physical Society","department":[{"_id":"MaSe"},{"_id":"GradSch"},{"_id":"MiLe"}],"year":"2021","acknowledgement":"We acknowledge useful discussions with V. Gritsev and A. Garkun and suggestions on implementation of the\r\nPPXPP model by D. Bluvstein. A. M. and M. S. were supported by the European Research Council (ERC) under\r\nthe European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899)"},{"month":"08","publication_identifier":{"eissn":["1079-7114"],"issn":["0031-9007"]},"doi":"10.1103/PhysRevLett.127.090602","language":[{"iso":"eng"}],"oa":1,"external_id":{"isi":["000692200100002"],"arxiv":["2102.13160"]},"main_file_link":[{"url":"https://arxiv.org/abs/2102.13160","open_access":"1"}],"isi":1,"quality_controlled":"1","project":[{"grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020"}],"ec_funded":1,"article_number":"090602","author":[{"last_name":"Maskara","first_name":"N.","full_name":"Maskara, N."},{"id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-8443-1064","first_name":"Alexios","last_name":"Michailidis","full_name":"Michailidis, Alexios"},{"first_name":"W. W.","last_name":"Ho","full_name":"Ho, W. W."},{"last_name":"Bluvstein","first_name":"D.","full_name":"Bluvstein, D."},{"full_name":"Choi, S.","first_name":"S.","last_name":"Choi"},{"full_name":"Lukin, M. D.","first_name":"M. D.","last_name":"Lukin"},{"full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","first_name":"Maksym"}],"date_updated":"2023-08-11T10:57:51Z","date_created":"2021-08-28T08:08:58Z","volume":127,"acknowledgement":"We thank Dmitry Abanin, Ehud Altman, Iris Cong, Sepehr Ebadi, Alex Keesling, Harry Levine, Ahmed Omran, Hannes Pichler, Rhine Samajdar, Guilia Semeghini, Tout Wang, Norman Yao, and Harry Zhou or stimulating discussions. We acknowledge support from the Center for Ultracold Atoms, the National Science Foundation, the Vannevar Bush Faculty Fellowship, the U.S. Department of Energy, the Army Research Office MURI, and the DARPA ONISQ program (M. L., N. M, W. W. H., D. B.); the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Programme Grant Agreement No. 850899 (A. M. and M. S.); the Department of Energy Computational Science Graduate Fellowship under Awards No. DESC0021110 (N. M.); the Moore Foundation EPiQS initiative Grant No. GBMF4306, the National University of Singapore (NUS) Development Grant AY2019/2020 and the Stanford Institute for Theoretical Physics (W. W. H.); the NSF Graduate Research Fellowship Program (Grant No. DGE1745303) and The Fannie and John Hertz Foundation (D. B.); the Miller Institute for Basic Research in Science (S. C.); DOE Quantum Systems Accelerator – Contract No. 7568717; and DOE Programmable Quantum Simulators for Lattice Gauge Theories and Gauge-Gravity Correspondence – Grant No. DE-SC0021013.","year":"2021","publication_status":"published","department":[{"_id":"MaSe"}],"publisher":"American Physical Society","day":"27","article_processing_charge":"No","date_published":"2021-08-27T00:00:00Z","publication":"Physical Review Letters","citation":{"ama":"Maskara N, Michailidis A, Ho WW, et al. Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving. Physical Review Letters. 2021;127(9). doi:10.1103/PhysRevLett.127.090602","ista":"Maskara N, Michailidis A, Ho WW, Bluvstein D, Choi S, Lukin MD, Serbyn M. 2021. Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving. Physical Review Letters. 127(9), 090602.","ieee":"N. Maskara et al., “Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving,” Physical Review Letters, vol. 127, no. 9. American Physical Society, 2021.","apa":"Maskara, N., Michailidis, A., Ho, W. W., Bluvstein, D., Choi, S., Lukin, M. D., & Serbyn, M. (2021). Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.127.090602","mla":"Maskara, N., et al. “Discrete Time-Crystalline Order Enabled by Quantum Many-Body Scars: Entanglement Steering via Periodic Driving.” Physical Review Letters, vol. 127, no. 9, 090602, American Physical Society, 2021, doi:10.1103/PhysRevLett.127.090602.","short":"N. Maskara, A. Michailidis, W.W. Ho, D. Bluvstein, S. Choi, M.D. Lukin, M. Serbyn, Physical Review Letters 127 (2021).","chicago":"Maskara, N., Alexios Michailidis, W. W. Ho, D. Bluvstein, S. Choi, M. D. Lukin, and Maksym Serbyn. “Discrete Time-Crystalline Order Enabled by Quantum Many-Body Scars: Entanglement Steering via Periodic Driving.” Physical Review Letters. American Physical Society, 2021. https://doi.org/10.1103/PhysRevLett.127.090602."},"article_type":"letter_note","abstract":[{"text":"The control of many-body quantum dynamics in complex systems is a key challenge in the quest to reliably produce and manipulate large-scale quantum entangled states. Recently, quench experiments in Rydberg atom arrays [Bluvstein et al. Science 371, 1355 (2021)] demonstrated that coherent revivals associated with quantum many-body scars can be stabilized by periodic driving, generating stable subharmonic responses over a wide parameter regime. We analyze a simple, related model where these phenomena originate from spatiotemporal ordering in an effective Floquet unitary, corresponding to discrete time-crystalline behavior in a prethermal regime. Unlike conventional discrete time crystals, the subharmonic response exists only for Néel-like initial states, associated with quantum scars. We predict robustness to perturbations and identify emergent timescales that could be observed in future experiments. Our results suggest a route to controlling entanglement in interacting quantum systems by combining periodic driving with many-body scars.","lang":"eng"}],"issue":"9","type":"journal_article","oa_version":"Submitted Version","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","_id":"9960","title":"Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving","status":"public","intvolume":" 127"},{"intvolume":" 126","status":"public","title":"Entanglement view of dynamical quantum phase transitions","ddc":["530"],"_id":"9048","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","file":[{"date_created":"2021-02-03T12:47:04Z","date_updated":"2021-02-03T12:47:04Z","checksum":"d9acbc502390ed7a97e631d23ae19ecd","success":1,"relation":"main_file","file_id":"9074","content_type":"application/pdf","file_size":398075,"creator":"dernst","file_name":"2021_PhysicalRevLett_DeNicola.pdf","access_level":"open_access"}],"oa_version":"Published Version","type":"journal_article","issue":"4","abstract":[{"lang":"eng","text":"The analogy between an equilibrium partition function and the return probability in many-body unitary dynamics has led to the concept of dynamical quantum phase transition (DQPT). DQPTs are defined by nonanalyticities in the return amplitude and are present in many models. In some cases, DQPTs can be related to equilibrium concepts, such as order parameters, yet their universal description is an open question. In this Letter, we provide first steps toward a classification of DQPTs by using a matrix product state description of unitary dynamics in the thermodynamic limit. This allows us to distinguish the two limiting cases of “precession” and “entanglement” DQPTs, which are illustrated using an analytical description in the quantum Ising model. While precession DQPTs are characterized by a large entanglement gap and are semiclassical in their nature, entanglement DQPTs occur near avoided crossings in the entanglement spectrum and can be distinguished by a complex pattern of nonlocal correlations. We demonstrate the existence of precession and entanglement DQPTs beyond Ising models, discuss observables that can distinguish them, and relate their interplay to complex DQPT phenomenology."}],"article_type":"original","citation":{"chicago":"De Nicola, Stefano, Alexios Michailidis, and Maksym Serbyn. “Entanglement View of Dynamical Quantum Phase Transitions.” Physical Review Letters. American Physical Society, 2021. https://doi.org/10.1103/physrevlett.126.040602.","mla":"De Nicola, Stefano, et al. “Entanglement View of Dynamical Quantum Phase Transitions.” Physical Review Letters, vol. 126, no. 4, 040602, American Physical Society, 2021, doi:10.1103/physrevlett.126.040602.","short":"S. De Nicola, A. Michailidis, M. Serbyn, Physical Review Letters 126 (2021).","ista":"De Nicola S, Michailidis A, Serbyn M. 2021. Entanglement view of dynamical quantum phase transitions. Physical Review Letters. 126(4), 040602.","ieee":"S. De Nicola, A. Michailidis, and M. Serbyn, “Entanglement view of dynamical quantum phase transitions,” Physical Review Letters, vol. 126, no. 4. American Physical Society, 2021.","apa":"De Nicola, S., Michailidis, A., & Serbyn, M. (2021). Entanglement view of dynamical quantum phase transitions. Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.126.040602","ama":"De Nicola S, Michailidis A, Serbyn M. Entanglement view of dynamical quantum phase transitions. Physical Review Letters. 2021;126(4). doi:10.1103/physrevlett.126.040602"},"publication":"Physical Review Letters","date_published":"2021-01-29T00:00:00Z","keyword":["General Physics and Astronomy"],"article_processing_charge":"Yes","has_accepted_license":"1","day":"29","department":[{"_id":"MaSe"}],"publisher":"American Physical Society","publication_status":"published","acknowledgement":"S. D. N. acknowledges funding from the Institute of Science and Technology (IST) Austria and from the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Skłodowska-Curie Grant Agreement No. 754411. A. M. and M. S. were supported by the European Research Council (ERC) under the European Union’s Horizon 2020 Research and\r\nInnovation Programme (Grant Agreement No. 850899).","year":"2021","volume":126,"date_updated":"2023-09-05T12:08:58Z","date_created":"2021-02-01T09:20:00Z","author":[{"full_name":"De Nicola, Stefano","id":"42832B76-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-4842-6671","first_name":"Stefano","last_name":"De Nicola"},{"orcid":"0000-0002-8443-1064","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","last_name":"Michailidis","first_name":"Alexios","full_name":"Michailidis, Alexios"},{"full_name":"Serbyn, Maksym","first_name":"Maksym","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827"}],"article_number":"040602","ec_funded":1,"file_date_updated":"2021-02-03T12:47:04Z","project":[{"grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425","name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020"},{"name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E"}],"quality_controlled":"1","isi":1,"oa":1,"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png"},"external_id":{"arxiv":["2008.04894"],"isi":["000613148200001"]},"language":[{"iso":"eng"}],"doi":"10.1103/physrevlett.126.040602","publication_identifier":{"issn":["0031-9007"],"eissn":["1079-7114"]},"month":"01"},{"date_published":"2020-06-22T00:00:00Z","publication":"Physical Review Research","citation":{"mla":"Michailidis, Alexios, et al. “Stabilizing Two-Dimensional Quantum Scars by Deformation and Synchronization.” Physical Review Research, vol. 2, no. 2, 022065, American Physical Society, 2020, doi:10.1103/physrevresearch.2.022065.","short":"A. Michailidis, C.J. Turner, Z. Papić, D.A. Abanin, M. Serbyn, Physical Review Research 2 (2020).","chicago":"Michailidis, Alexios, C. J. Turner, Z. Papić, D. A. Abanin, and Maksym Serbyn. “Stabilizing Two-Dimensional Quantum Scars by Deformation and Synchronization.” Physical Review Research. American Physical Society, 2020. https://doi.org/10.1103/physrevresearch.2.022065.","ama":"Michailidis A, Turner CJ, Papić Z, Abanin DA, Serbyn M. Stabilizing two-dimensional quantum scars by deformation and synchronization. Physical Review Research. 2020;2(2). doi:10.1103/physrevresearch.2.022065","ista":"Michailidis A, Turner CJ, Papić Z, Abanin DA, Serbyn M. 2020. Stabilizing two-dimensional quantum scars by deformation and synchronization. Physical Review Research. 2(2), 022065.","apa":"Michailidis, A., Turner, C. J., Papić, Z., Abanin, D. A., & Serbyn, M. (2020). Stabilizing two-dimensional quantum scars by deformation and synchronization. Physical Review Research. American Physical Society. https://doi.org/10.1103/physrevresearch.2.022065","ieee":"A. Michailidis, C. J. Turner, Z. Papić, D. A. Abanin, and M. Serbyn, “Stabilizing two-dimensional quantum scars by deformation and synchronization,” Physical Review Research, vol. 2, no. 2. American Physical Society, 2020."},"article_type":"original","day":"22","has_accepted_license":"1","article_processing_charge":"No","oa_version":"Published Version","file":[{"file_name":"2020_PhysicalReviewResearch_Michailidis.pdf","access_level":"open_access","file_size":2066011,"content_type":"application/pdf","creator":"dernst","relation":"main_file","file_id":"8050","date_created":"2020-06-29T14:41:27Z","date_updated":"2020-07-14T12:48:08Z","checksum":"e6959dc8220f14a008d1933858795e6d"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"8011","title":"Stabilizing two-dimensional quantum scars by deformation and synchronization","status":"public","ddc":["530"],"intvolume":" 2","abstract":[{"text":"Relaxation to a thermal state is the inevitable fate of nonequilibrium interacting quantum systems without special conservation laws. While thermalization in one-dimensional systems can often be suppressed by integrability mechanisms, in two spatial dimensions thermalization is expected to be far more effective due to the increased phase space. In this work we propose a general framework for escaping or delaying the emergence of the thermal state in two-dimensional arrays of Rydberg atoms via the mechanism of quantum scars, i.e., initial states that fail to thermalize. The suppression of thermalization is achieved in two complementary ways: by adding local perturbations or by adjusting the driving Rabi frequency according to the local connectivity of the lattice. We demonstrate that these mechanisms allow us to realize robust quantum scars in various two-dimensional lattices, including decorated lattices with nonconstant connectivity. In particular, we show that a small decrease of the Rabi frequency at the corners of the lattice is crucial for mitigating the strong boundary effects in two-dimensional systems. Our results identify synchronization as an important tool for future experiments on two-dimensional quantum scars.","lang":"eng"}],"issue":"2","type":"journal_article","doi":"10.1103/physrevresearch.2.022065","language":[{"iso":"eng"}],"oa":1,"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png"},"quality_controlled":"1","project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"month":"06","publication_identifier":{"issn":["2643-1564"]},"author":[{"first_name":"Alexios","last_name":"Michailidis","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","full_name":"Michailidis, Alexios"},{"last_name":"Turner","first_name":"C. J.","full_name":"Turner, C. J."},{"last_name":"Papić","first_name":"Z.","full_name":"Papić, Z."},{"full_name":"Abanin, D. A.","last_name":"Abanin","first_name":"D. A."},{"full_name":"Serbyn, Maksym","last_name":"Serbyn","first_name":"Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"}],"date_created":"2020-06-23T12:00:19Z","date_updated":"2021-01-12T08:16:30Z","volume":2,"year":"2020","publication_status":"published","department":[{"_id":"MaSe"}],"publisher":"American Physical Society","file_date_updated":"2020-07-14T12:48:08Z","ec_funded":1,"article_number":"022065"},{"article_type":"original","publication":"Physical Review X","citation":{"chicago":"Michailidis, Alexios, C. J. Turner, Z. Papić, D. A. Abanin, and Maksym Serbyn. “Slow Quantum Thermalization and Many-Body Revivals from Mixed Phase Space.” Physical Review X. American Physical Society, 2020. https://doi.org/10.1103/physrevx.10.011055.","mla":"Michailidis, Alexios, et al. “Slow Quantum Thermalization and Many-Body Revivals from Mixed Phase Space.” Physical Review X, vol. 10, no. 1, 011055, American Physical Society, 2020, doi:10.1103/physrevx.10.011055.","short":"A. Michailidis, C.J. Turner, Z. Papić, D.A. Abanin, M. Serbyn, Physical Review X 10 (2020).","ista":"Michailidis A, Turner CJ, Papić Z, Abanin DA, Serbyn M. 2020. Slow quantum thermalization and many-body revivals from mixed phase space. Physical Review X. 10(1), 011055.","apa":"Michailidis, A., Turner, C. J., Papić, Z., Abanin, D. A., & Serbyn, M. (2020). Slow quantum thermalization and many-body revivals from mixed phase space. Physical Review X. American Physical Society. https://doi.org/10.1103/physrevx.10.011055","ieee":"A. Michailidis, C. J. Turner, Z. Papić, D. A. Abanin, and M. Serbyn, “Slow quantum thermalization and many-body revivals from mixed phase space,” Physical Review X, vol. 10, no. 1. American Physical Society, 2020.","ama":"Michailidis A, Turner CJ, Papić Z, Abanin DA, Serbyn M. Slow quantum thermalization and many-body revivals from mixed phase space. Physical Review X. 2020;10(1). doi:10.1103/physrevx.10.011055"},"date_published":"2020-03-04T00:00:00Z","scopus_import":"1","day":"04","has_accepted_license":"1","article_processing_charge":"No","title":"Slow quantum thermalization and many-body revivals from mixed phase space","status":"public","ddc":["530"],"intvolume":" 10","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","_id":"7570","oa_version":"Published Version","file":[{"creator":"dernst","content_type":"application/pdf","file_size":17828638,"access_level":"open_access","file_name":"2020_PhysicalReviewX_Michailidis.pdf","checksum":"4b3f2c13873d35230173c73d0e11c408","date_updated":"2020-07-14T12:48:00Z","date_created":"2020-03-12T12:13:07Z","file_id":"7581","relation":"main_file"}],"type":"journal_article","abstract":[{"lang":"eng","text":"The relaxation of few-body quantum systems can strongly depend on the initial state when the system’s semiclassical phase space is mixed; i.e., regions of chaotic motion coexist with regular islands. In recent years, there has been much effort to understand the process of thermalization in strongly interacting quantum systems that often lack an obvious semiclassical limit. The time-dependent variational principle (TDVP) allows one to systematically derive an effective classical (nonlinear) dynamical system by projecting unitary many-body dynamics onto a manifold of weakly entangled variational states. We demonstrate that such dynamical systems generally possess mixed phase space. When TDVP errors are small, the mixed phase space leaves a footprint on the exact dynamics of the quantum model. For example, when the system is initialized in a state belonging to a stable periodic orbit or the surrounding regular region, it exhibits persistent many-body quantum revivals. As a proof of principle, we identify new types of “quantum many-body scars,” i.e., initial states that lead to long-time oscillations in a model of interacting Rydberg atoms in one and two dimensions. Intriguingly, the initial states that give rise to most robust revivals are typically entangled states. On the other hand, even when TDVP errors are large, as in the thermalizing tilted-field Ising model, initializing the system in a regular region of phase space leads to a surprising slowdown of thermalization. Our work establishes TDVP as a method for identifying interacting quantum systems with anomalous dynamics in arbitrary dimensions. Moreover, the mixed phase space classical variational equations allow one to find slowly thermalizing initial conditions in interacting models. Our results shed light on a link between classical and quantum chaos, pointing toward possible extensions of the classical Kolmogorov-Arnold-Moser theorem to quantum systems."}],"issue":"1","isi":1,"quality_controlled":"1","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png"},"oa":1,"external_id":{"arxiv":["1905.08564"],"isi":["000517969300001"]},"language":[{"iso":"eng"}],"doi":"10.1103/physrevx.10.011055","month":"03","publication_identifier":{"issn":["2160-3308"]},"publication_status":"published","publisher":"American Physical Society","department":[{"_id":"MaSe"}],"year":"2020","date_updated":"2023-08-18T07:01:07Z","date_created":"2020-03-08T18:02:01Z","volume":10,"author":[{"full_name":"Michailidis, Alexios","first_name":"Alexios","last_name":"Michailidis","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-8443-1064"},{"first_name":"C. J.","last_name":"Turner","full_name":"Turner, C. J."},{"full_name":"Papić, Z.","last_name":"Papić","first_name":"Z."},{"last_name":"Abanin","first_name":"D. A.","full_name":"Abanin, D. A."},{"last_name":"Serbyn","first_name":"Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym"}],"related_material":{"link":[{"url":"https://ist.ac.at/en/news/classical-physics-helps-predict-fate-of-interacting-quantum-systems/","description":"News on IST Homepage","relation":"press_release"}]},"article_number":"011055","file_date_updated":"2020-07-14T12:48:00Z"},{"type":"journal_article","abstract":[{"text":"Motivated by recent experimental observations of coherent many-body revivals in a constrained Rydbergatom chain, we construct a weak quasilocal deformation of the Rydberg-blockaded Hamiltonian, whichmakes the revivals virtually perfect. Our analysis suggests the existence of an underlying nonintegrableHamiltonian which supports an emergent SU(2)-spin dynamics within a small subspace of the many-bodyHilbert space. We show that such perfect dynamics necessitates the existence of atypical, nonergodicenergy eigenstates—quantum many-body scars. Furthermore, using these insights, we construct a toymodel that hosts exact quantum many-body scars, providing an intuitive explanation of their origin. Ourresults offer specific routes to enhancing coherent many-body revivals and provide a step towardestablishing the stability of quantum many-body scars in the thermodynamic limit.","lang":"eng"}],"issue":"22","status":"public","title":"Emergent SU(2) dynamics and perfect quantum many-body scars","intvolume":" 122","_id":"6575","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa_version":"Preprint","scopus_import":"1","day":"07","article_processing_charge":"No","article_type":"original","publication":"Physical Review Letters","citation":{"chicago":"Choi, Soonwon, Christopher J. Turner, Hannes Pichler, Wen Wei Ho, Alexios Michailidis, Zlatko Papić, Maksym Serbyn, Mikhail D. Lukin, and Dmitry A. Abanin. “Emergent SU(2) Dynamics and Perfect Quantum Many-Body Scars.” Physical Review Letters. American Physical Society, 2019. https://doi.org/10.1103/PhysRevLett.122.220603.","mla":"Choi, Soonwon, et al. “Emergent SU(2) Dynamics and Perfect Quantum Many-Body Scars.” Physical Review Letters, vol. 122, no. 22, 220603, American Physical Society, 2019, doi:10.1103/PhysRevLett.122.220603.","short":"S. Choi, C.J. Turner, H. Pichler, W.W. Ho, A. Michailidis, Z. Papić, M. Serbyn, M.D. Lukin, D.A. Abanin, Physical Review Letters 122 (2019).","ista":"Choi S, Turner CJ, Pichler H, Ho WW, Michailidis A, Papić Z, Serbyn M, Lukin MD, Abanin DA. 2019. Emergent SU(2) dynamics and perfect quantum many-body scars. Physical Review Letters. 122(22), 220603.","ieee":"S. Choi et al., “Emergent SU(2) dynamics and perfect quantum many-body scars,” Physical Review Letters, vol. 122, no. 22. American Physical Society, 2019.","apa":"Choi, S., Turner, C. J., Pichler, H., Ho, W. W., Michailidis, A., Papić, Z., … Abanin, D. A. (2019). Emergent SU(2) dynamics and perfect quantum many-body scars. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.122.220603","ama":"Choi S, Turner CJ, Pichler H, et al. Emergent SU(2) dynamics and perfect quantum many-body scars. Physical Review Letters. 2019;122(22). doi:10.1103/PhysRevLett.122.220603"},"date_published":"2019-06-07T00:00:00Z","article_number":"220603","publication_status":"published","department":[{"_id":"MaSe"}],"publisher":"American Physical Society","year":"2019","date_updated":"2024-02-28T13:12:22Z","date_created":"2019-06-23T21:59:13Z","volume":122,"author":[{"first_name":"Soonwon","last_name":"Choi","full_name":"Choi, Soonwon"},{"full_name":"Turner, Christopher J.","first_name":"Christopher J.","last_name":"Turner"},{"last_name":"Pichler","first_name":"Hannes","full_name":"Pichler, Hannes"},{"last_name":"Ho","first_name":"Wen Wei","full_name":"Ho, Wen Wei"},{"full_name":"Michailidis, Alexios","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-8443-1064","first_name":"Alexios","last_name":"Michailidis"},{"last_name":"Papić","first_name":"Zlatko","full_name":"Papić, Zlatko"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827","first_name":"Maksym","last_name":"Serbyn","full_name":"Serbyn, Maksym"},{"full_name":"Lukin, Mikhail D.","last_name":"Lukin","first_name":"Mikhail D."},{"last_name":"Abanin","first_name":"Dmitry A.","full_name":"Abanin, Dmitry A."}],"month":"06","publication_identifier":{"issn":["00319007"],"eissn":["10797114"]},"isi":1,"quality_controlled":"1","external_id":{"isi":["000470885800005"],"arxiv":["1812.05561"]},"oa":1,"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1812.05561"}],"language":[{"iso":"eng"}],"doi":"10.1103/PhysRevLett.122.220603"},{"date_published":"2019-10-01T00:00:00Z","article_type":"original","citation":{"chicago":"Orell, Tuure, Alexios Michailidis, Maksym Serbyn, and Matti Silveri. “Probing the Many-Body Localization Phase Transition with Superconducting Circuits.” Physical Review B. American Physical Society, 2019. https://doi.org/10.1103/physrevb.100.134504.","short":"T. Orell, A. Michailidis, M. Serbyn, M. Silveri, Physical Review B 100 (2019).","mla":"Orell, Tuure, et al. “Probing the Many-Body Localization Phase Transition with Superconducting Circuits.” Physical Review B, vol. 100, no. 13, 134504, American Physical Society, 2019, doi:10.1103/physrevb.100.134504.","ieee":"T. Orell, A. Michailidis, M. Serbyn, and M. Silveri, “Probing the many-body localization phase transition with superconducting circuits,” Physical Review B, vol. 100, no. 13. American Physical Society, 2019.","apa":"Orell, T., Michailidis, A., Serbyn, M., & Silveri, M. (2019). Probing the many-body localization phase transition with superconducting circuits. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.100.134504","ista":"Orell T, Michailidis A, Serbyn M, Silveri M. 2019. Probing the many-body localization phase transition with superconducting circuits. Physical Review B. 100(13), 134504.","ama":"Orell T, Michailidis A, Serbyn M, Silveri M. Probing the many-body localization phase transition with superconducting circuits. Physical Review B. 2019;100(13). doi:10.1103/physrevb.100.134504"},"publication":"Physical Review B","article_processing_charge":"No","day":"01","scopus_import":"1","oa_version":"Preprint","intvolume":" 100","status":"public","title":"Probing the many-body localization phase transition with superconducting circuits","_id":"7013","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","issue":"13","abstract":[{"text":"Chains of superconducting circuit devices provide a natural platform for studies of synthetic bosonic quantum matter. Motivated by the recent experimental progress in realizing disordered and interacting chains of superconducting transmon devices, we study the bosonic many-body localization phase transition using the methods of exact diagonalization as well as matrix product state dynamics. We estimate the location of transition separating the ergodic and the many-body localized phases as a function of the disorder strength and the many-body on-site interaction strength. The main difference between the bosonic model realized by superconducting circuits and similar fermionic model is that the effect of the on-site interaction is stronger due to the possibility of multiple excitations occupying the same site. The phase transition is found to be robust upon including longer-range hopping and interaction terms present in the experiments. Furthermore, we calculate experimentally relevant local observables and show that their temporal fluctuations can be used to distinguish between the dynamics of Anderson insulator, many-body localization, and delocalized phases. While we consider unitary dynamics, neglecting the effects of dissipation, decoherence, and measurement back action, the timescales on which the dynamics is unitary are sufficient for observation of characteristic dynamics in the many-body localized phase. Moreover, the experimentally available disorder strength and interactions allow for tuning the many-body localization phase transition, thus making the arrays of superconducting circuit devices a promising platform for exploring localization physics and phase transition.","lang":"eng"}],"type":"journal_article","language":[{"iso":"eng"}],"doi":"10.1103/physrevb.100.134504","isi":1,"quality_controlled":"1","oa":1,"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1907.04043"}],"external_id":{"arxiv":["1907.04043"],"isi":["000489036500004"]},"publication_identifier":{"eissn":["2469-9969"],"issn":["2469-9950"]},"month":"10","volume":100,"date_created":"2019-11-13T08:25:48Z","date_updated":"2024-02-28T13:13:13Z","author":[{"first_name":"Tuure","last_name":"Orell","full_name":"Orell, Tuure"},{"first_name":"Alexios","last_name":"Michailidis","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-8443-1064","full_name":"Michailidis, Alexios"},{"full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827","first_name":"Maksym","last_name":"Serbyn"},{"full_name":"Silveri, Matti","last_name":"Silveri","first_name":"Matti"}],"publisher":"American Physical Society","department":[{"_id":"MaSe"}],"publication_status":"published","year":"2019","article_number":"134504"},{"article_number":"104307","publist_id":"7538","year":"2018","acknowledgement":"We thank F. Huveneers for useful discussions. Z.P. and A.M. acknowledge support by EPSRC Grant No. EP/P009409/1 and and the Royal Society Research Grant No. RG160635. Statement of compliance with EPSRC policy framework on research data: This publication is theoretical work that does not require supporting research data. D.A. acknowledges support by the Swiss National Science Foundation. M.Z., M.M. and T.P. acknowledge Grants J1-7279 (M.Z.) and N1-0025 (M.M. and T.P.) of Slovenian Research Agency, and Advanced Grant of European Research Council, Grant No. 694544 - OMNES (T.P.).","department":[{"_id":"MaSe"}],"publisher":"American Physical Society","publication_status":"published","author":[{"orcid":"0000-0002-8443-1064","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","last_name":"Michailidis","first_name":"Alexios","full_name":"Michailidis, Alexios"},{"last_name":"Žnidarič","first_name":"Marko","full_name":"Žnidarič, Marko"},{"full_name":"Medvedyeva, Mariya","last_name":"Medvedyeva","first_name":"Mariya"},{"last_name":"Abanin","first_name":"Dmitry","full_name":"Abanin, Dmitry"},{"full_name":"Prosen, Tomaž","first_name":"Tomaž","last_name":"Prosen"},{"last_name":"Papić","first_name":"Zlatko","full_name":"Papić, Zlatko"}],"volume":97,"date_created":"2018-12-11T11:45:50Z","date_updated":"2023-09-18T09:31:46Z","month":"03","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1706.05026"}],"external_id":{"isi":["000427798800005"]},"oa":1,"quality_controlled":"1","isi":1,"doi":"10.1103/PhysRevB.97.104307","language":[{"iso":"eng"}],"type":"journal_article","issue":"10","abstract":[{"text":"Many-body quantum systems typically display fast dynamics and ballistic spreading of information. Here we address the open problem of how slow the dynamics can be after a generic breaking of integrability by local interactions. We develop a method based on degenerate perturbation theory that reveals slow dynamical regimes and delocalization processes in general translation invariant models, along with accurate estimates of their delocalization time scales. Our results shed light on the fundamental questions of the robustness of quantum integrable systems and the possibility of many-body localization without disorder. As an example, we construct a large class of one-dimensional lattice models where, despite the absence of asymptotic localization, the transient dynamics is exceptionally slow, i.e., the dynamics is indistinguishable from that of many-body localized systems for the system sizes and time scales accessible in experiments and numerical simulations.","lang":"eng"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","_id":"327","intvolume":" 97","title":"Slow dynamics in translation-invariant quantum lattice models","status":"public","oa_version":"Preprint","scopus_import":"1","article_processing_charge":"No","day":"19","citation":{"ieee":"A. Michailidis, M. Žnidarič, M. Medvedyeva, D. Abanin, T. Prosen, and Z. Papić, “Slow dynamics in translation-invariant quantum lattice models,” Physical Review B, vol. 97, no. 10. American Physical Society, 2018.","apa":"Michailidis, A., Žnidarič, M., Medvedyeva, M., Abanin, D., Prosen, T., & Papić, Z. (2018). Slow dynamics in translation-invariant quantum lattice models. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.97.104307","ista":"Michailidis A, Žnidarič M, Medvedyeva M, Abanin D, Prosen T, Papić Z. 2018. Slow dynamics in translation-invariant quantum lattice models. Physical Review B. 97(10), 104307.","ama":"Michailidis A, Žnidarič M, Medvedyeva M, Abanin D, Prosen T, Papić Z. Slow dynamics in translation-invariant quantum lattice models. Physical Review B. 2018;97(10). doi:10.1103/PhysRevB.97.104307","chicago":"Michailidis, Alexios, Marko Žnidarič, Mariya Medvedyeva, Dmitry Abanin, Tomaž Prosen, and Zlatko Papić. “Slow Dynamics in Translation-Invariant Quantum Lattice Models.” Physical Review B. American Physical Society, 2018. https://doi.org/10.1103/PhysRevB.97.104307.","short":"A. Michailidis, M. Žnidarič, M. Medvedyeva, D. Abanin, T. Prosen, Z. Papić, Physical Review B 97 (2018).","mla":"Michailidis, Alexios, et al. “Slow Dynamics in Translation-Invariant Quantum Lattice Models.” Physical Review B, vol. 97, no. 10, 104307, American Physical Society, 2018, doi:10.1103/PhysRevB.97.104307."},"publication":"Physical Review B","date_published":"2018-03-19T00:00:00Z"},{"intvolume":" 14","status":"public","title":"Weak ergodicity breaking from quantum many-body scars","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","_id":"296","oa_version":"Submitted Version","type":"journal_article","abstract":[{"text":"The thermodynamic description of many-particle systems rests on the assumption of ergodicity, the ability of a system to explore all allowed configurations in the phase space. Recent studies on many-body localization have revealed the existence of systems that strongly violate ergodicity in the presence of quenched disorder. Here, we demonstrate that ergodicity can be weakly broken by a different mechanism, arising from the presence of special eigenstates in the many-body spectrum that are reminiscent of quantum scars in chaotic non-interacting systems. In the single-particle case, quantum scars correspond to wavefunctions that concentrate in the vicinity of unstable periodic classical trajectories. We show that many-body scars appear in the Fibonacci chain, a model with a constrained local Hilbert space that has recently been experimentally realized in a Rydberg-atom quantum simulator. The quantum scarred eigenstates are embedded throughout the otherwise thermalizing many-body spectrum but lead to direct experimental signatures, as we show for periodic recurrences that reproduce those observed in the experiment. Our results suggest that scarred many-body bands give rise to a new universality class of quantum dynamics, opening up opportunities for the creation of novel states with long-lived coherence in systems that are now experimentally realizable.","lang":"eng"}],"page":"745 - 749","article_type":"original","citation":{"chicago":"Turner, Christopher, Alexios Michailidis, Dmitry Abanin, Maksym Serbyn, and Zlatko Papić. “Weak Ergodicity Breaking from Quantum Many-Body Scars.” Nature Physics. Nature Publishing Group, 2018. https://doi.org/10.1038/s41567-018-0137-5.","short":"C. Turner, A. Michailidis, D. Abanin, M. Serbyn, Z. Papić, Nature Physics 14 (2018) 745–749.","mla":"Turner, Christopher, et al. “Weak Ergodicity Breaking from Quantum Many-Body Scars.” Nature Physics, vol. 14, Nature Publishing Group, 2018, pp. 745–49, doi:10.1038/s41567-018-0137-5.","ieee":"C. Turner, A. Michailidis, D. Abanin, M. Serbyn, and Z. Papić, “Weak ergodicity breaking from quantum many-body scars,” Nature Physics, vol. 14. Nature Publishing Group, pp. 745–749, 2018.","apa":"Turner, C., Michailidis, A., Abanin, D., Serbyn, M., & Papić, Z. (2018). Weak ergodicity breaking from quantum many-body scars. Nature Physics. Nature Publishing Group. https://doi.org/10.1038/s41567-018-0137-5","ista":"Turner C, Michailidis A, Abanin D, Serbyn M, Papić Z. 2018. Weak ergodicity breaking from quantum many-body scars. Nature Physics. 14, 745–749.","ama":"Turner C, Michailidis A, Abanin D, Serbyn M, Papić Z. Weak ergodicity breaking from quantum many-body scars. Nature Physics. 2018;14:745-749. doi:10.1038/s41567-018-0137-5"},"publication":"Nature Physics","date_published":"2018-05-14T00:00:00Z","scopus_import":"1","article_processing_charge":"No","day":"14","department":[{"_id":"MaSe"}],"publisher":"Nature Publishing Group","publication_status":"published","acknowledgement":"C.J.T., A.M. and Z.P. acknowledge support from EPSRC grants EP/P009409/1 and EP/M50807X/1, and Royal Society Research Grant RG160635. D.A. acknowledges support from the Swiss National Science Foundation.","year":"2018","volume":14,"date_created":"2018-12-11T11:45:40Z","date_updated":"2023-09-19T10:37:55Z","author":[{"full_name":"Turner, Christopher","last_name":"Turner","first_name":"Christopher"},{"id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-8443-1064","first_name":"Alexios","last_name":"Michailidis","full_name":"Michailidis, Alexios"},{"full_name":"Abanin, Dmitry","first_name":"Dmitry","last_name":"Abanin"},{"last_name":"Serbyn","first_name":"Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym"},{"full_name":"Papić, Zlatko","last_name":"Papić","first_name":"Zlatko"}],"publist_id":"7585","isi":1,"quality_controlled":"1","main_file_link":[{"open_access":"1","url":"http://eprints.whiterose.ac.uk/130860/"}],"external_id":{"isi":["000438253600028"]},"oa":1,"language":[{"iso":"eng"}],"doi":"10.1038/s41567-018-0137-5","month":"05"},{"day":"22","article_processing_charge":"No","scopus_import":"1","date_published":"2018-10-22T00:00:00Z","publication":"Physical Review B","citation":{"ama":"Turner CJ, Michailidis A, Abanin DA, Serbyn M, Papić Z. Quantum scarred eigenstates in a Rydberg atom chain: Entanglement, breakdown of thermalization, and stability to perturbations. Physical Review B. 2018;98(15). doi:10.1103/PhysRevB.98.155134","ista":"Turner CJ, Michailidis A, Abanin DA, Serbyn M, Papić Z. 2018. Quantum scarred eigenstates in a Rydberg atom chain: Entanglement, breakdown of thermalization, and stability to perturbations. Physical Review B. 98(15), 155134.","ieee":"C. J. Turner, A. Michailidis, D. A. Abanin, M. Serbyn, and Z. Papić, “Quantum scarred eigenstates in a Rydberg atom chain: Entanglement, breakdown of thermalization, and stability to perturbations,” Physical Review B, vol. 98, no. 15. American Physical Society, 2018.","apa":"Turner, C. J., Michailidis, A., Abanin, D. A., Serbyn, M., & Papić, Z. (2018). Quantum scarred eigenstates in a Rydberg atom chain: Entanglement, breakdown of thermalization, and stability to perturbations. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.98.155134","mla":"Turner, C. J., et al. “Quantum Scarred Eigenstates in a Rydberg Atom Chain: Entanglement, Breakdown of Thermalization, and Stability to Perturbations.” Physical Review B, vol. 98, no. 15, 155134, American Physical Society, 2018, doi:10.1103/PhysRevB.98.155134.","short":"C.J. Turner, A. Michailidis, D.A. Abanin, M. Serbyn, Z. Papić, Physical Review B 98 (2018).","chicago":"Turner, C J, Alexios Michailidis, D A Abanin, Maksym Serbyn, and Z Papić. “Quantum Scarred Eigenstates in a Rydberg Atom Chain: Entanglement, Breakdown of Thermalization, and Stability to Perturbations.” Physical Review B. American Physical Society, 2018. https://doi.org/10.1103/PhysRevB.98.155134."},"abstract":[{"text":"Recent realization of a kinetically constrained chain of Rydberg atoms by Bernien et al., [Nature (London) 551, 579 (2017)] resulted in the observation of unusual revivals in the many-body quantum dynamics. In our previous work [C. J. Turner et al., Nat. Phys. 14, 745 (2018)], such dynamics was attributed to the existence of “quantum scarred” eigenstates in the many-body spectrum of the experimentally realized model. Here, we present a detailed study of the eigenstate properties of the same model. We find that the majority of the eigenstates exhibit anomalous thermalization: the observable expectation values converge to their Gibbs ensemble values, but parametrically slower compared to the predictions of the eigenstate thermalization hypothesis (ETH). Amidst the thermalizing spectrum, we identify nonergodic eigenstates that strongly violate the ETH, whose number grows polynomially with system size. Previously, the same eigenstates were identified via large overlaps with certain product states, and were used to explain the revivals observed in experiment. Here, we find that these eigenstates, in addition to highly atypical expectation values of local observables, also exhibit subthermal entanglement entropy that scales logarithmically with the system size. Moreover, we identify an additional class of quantum scarred eigenstates, and discuss their manifestations in the dynamics starting from initial product states. We use forward scattering approximation to describe the structure and physical properties of quantum scarred eigenstates. Finally, we discuss the stability of quantum scars to various perturbations. We observe that quantum scars remain robust when the introduced perturbation is compatible with the forward scattering approximation. In contrast, the perturbations which most efficiently destroy quantum scars also lead to the restoration of “canonical” thermalization.","lang":"eng"}],"issue":"15","type":"journal_article","oa_version":"Preprint","title":"Quantum scarred eigenstates in a Rydberg atom chain: Entanglement, breakdown of thermalization, and stability to perturbations","status":"public","intvolume":" 98","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"44","month":"10","acknowledged_ssus":[{"_id":"ScienComp"}],"language":[{"iso":"eng"}],"doi":"10.1103/PhysRevB.98.155134","isi":1,"quality_controlled":"1","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1806.10933"}],"external_id":{"isi":["000447919100001"],"arxiv":["1806.10933"]},"oa":1,"publist_id":"8010","article_number":"155134","date_created":"2018-12-11T11:44:19Z","date_updated":"2023-10-10T13:28:49Z","volume":98,"author":[{"last_name":"Turner","first_name":"C J","full_name":"Turner, C J"},{"full_name":"Michailidis, Alexios","last_name":"Michailidis","first_name":"Alexios","orcid":"0000-0002-8443-1064","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Abanin","first_name":"D A","full_name":"Abanin, D A"},{"full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","first_name":"Maksym"},{"full_name":"Papić, Z","first_name":"Z","last_name":"Papić"}],"publication_status":"published","department":[{"_id":"MaSe"}],"publisher":"American Physical Society","year":"2018"},{"author":[{"last_name":"Serbyn","first_name":"Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Maksym Serbyn"},{"full_name":"Alexios Michailidis","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","first_name":"Alexios","last_name":"Michailidis"},{"full_name":"Abanin, Dmitry A","first_name":"Dmitry","last_name":"Abanin"},{"full_name":"Papić, Zlatko","last_name":"Papić","first_name":"Zlatko"}],"date_updated":"2021-01-12T08:22:25Z","date_created":"2018-12-11T11:49:32Z","volume":117,"acknowledgement":"We thank M. Stoudenmire and C. Turner for useful discussions. M. S. was supported by Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF4307. This research was supported in part by the National Science Foundation under Grant No. NSF PHY11-25915, and by the Swiss National Science Foundation and Alfred Sloan Foundation (D. A.). This work made use of the facilities of N8 HPC Centre of Excellence, provided and funded by the N8 consortium and EPSRC (Grant No. EP/K000225/1). The Centre is coordinated by the Universities of Leeds and Manchester.","_id":"984","year":"2016","publication_status":"published","status":"public","title":"Power-law entanglement spectrum in many-body localized phases","publisher":"American Physical Society","intvolume":" 117","abstract":[{"lang":"eng","text":"The entanglement spectrum of the reduced density matrix contains information beyond the von Neumann entropy and provides unique insights into exotic orders or critical behavior of quantum systems. Here, we show that strongly disordered systems in the many-body localized phase have power-law entanglement spectra, arising from the presence of extensively many local integrals of motion. The power-law entanglement spectrum distinguishes many-body localized systems from ergodic systems, as well as from ground states of gapped integrable models or free systems in the vicinity of scale-invariant critical points. We confirm our results using large-scale exact diagonalization. In addition, we develop a matrix-product state algorithm which allows us to access the eigenstates of large systems close to the localization transition, and discuss general implications of our results for variational studies of highly excited eigenstates in many-body localized systems."}],"issue":"16","publist_id":"6414","extern":1,"type":"journal_article","date_published":"2016-10-16T00:00:00Z","doi":"10.1103/PhysRevLett.117.160601","publication":"Physical Review Letters","main_file_link":[{"url":"https://arxiv.org/abs/1605.05737","open_access":"1"}],"oa":1,"citation":{"ama":"Serbyn M, Michailidis A, Abanin D, Papić Z. Power-law entanglement spectrum in many-body localized phases. Physical Review Letters. 2016;117(16). doi:10.1103/PhysRevLett.117.160601","apa":"Serbyn, M., Michailidis, A., Abanin, D., & Papić, Z. (2016). Power-law entanglement spectrum in many-body localized phases. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.117.160601","ieee":"M. Serbyn, A. Michailidis, D. Abanin, and Z. Papić, “Power-law entanglement spectrum in many-body localized phases,” Physical Review Letters, vol. 117, no. 16. American Physical Society, 2016.","ista":"Serbyn M, Michailidis A, Abanin D, Papić Z. 2016. Power-law entanglement spectrum in many-body localized phases. Physical Review Letters. 117(16).","short":"M. Serbyn, A. Michailidis, D. Abanin, Z. Papić, Physical Review Letters 117 (2016).","mla":"Serbyn, Maksym, et al. “Power-Law Entanglement Spectrum in Many-Body Localized Phases.” Physical Review Letters, vol. 117, no. 16, American Physical Society, 2016, doi:10.1103/PhysRevLett.117.160601.","chicago":"Serbyn, Maksym, Alexios Michailidis, Dmitry Abanin, and Zlatko Papić. “Power-Law Entanglement Spectrum in Many-Body Localized Phases.” Physical Review Letters. American Physical Society, 2016. https://doi.org/10.1103/PhysRevLett.117.160601."},"quality_controlled":0,"month":"10","day":"16"}]