[{"_id":"11591","status":"public","type":"journal_article","article_type":"original","date_updated":"2023-08-03T11:58:16Z","department":[{"_id":"JoFi"}],"oa_version":"Preprint","abstract":[{"lang":"eng","text":"We investigate the deterministic generation and distribution of entanglement in large quantum networks by driving distant qubits with the output fields of a nondegenerate parametric amplifier. In this setting, the amplifier produces a continuous Gaussian two-mode squeezed state, which acts as a quantum-correlated reservoir for the qubits and relaxes them into a highly entangled steady state. Here we are interested in the maximal amount of entanglement and the optimal entanglement generation rates that can be achieved with this scheme under realistic conditions taking, in particular, the finite amplifier bandwidth, waveguide losses, and propagation delays into account. By combining exact numerical simulations of the full network with approximate analytic results, we predict the optimal working point for the amplifier and the corresponding qubit-qubit entanglement under various conditions. Our findings show that this passive conversion of Gaussian into discrete-variable entanglement offers a robust and experimentally very attractive approach for operating large optical, microwave, or hybrid quantum networks, for which efficient parametric amplifiers are currently developed."}],"month":"06","intvolume":" 105","scopus_import":"1","main_file_link":[{"open_access":"1","url":" https://doi.org/10.48550/arXiv.2204.02993"}],"language":[{"iso":"eng"}],"publication_identifier":{"issn":["2469-9926"],"eissn":["2469-9934"]},"publication_status":"published","issue":"6","volume":105,"ec_funded":1,"article_number":"062454","project":[{"name":"Quantum Local Area Networks with Superconducting Qubits","grant_number":"899354","_id":"9B868D20-BA93-11EA-9121-9846C619BF3A","call_identifier":"H2020"}],"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","citation":{"ama":"Agustí J, Minoguchi Y, Fink JM, Rabl P. Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams. Physical Review A. 2022;105(6). doi:10.1103/PhysRevA.105.062454","apa":"Agustí, J., Minoguchi, Y., Fink, J. M., & Rabl, P. (2022). Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.105.062454","ieee":"J. Agustí, Y. Minoguchi, J. M. Fink, and P. Rabl, “Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams,” Physical Review A, vol. 105, no. 6. American Physical Society, 2022.","short":"J. Agustí, Y. Minoguchi, J.M. Fink, P. Rabl, Physical Review A 105 (2022).","mla":"Agustí, J., et al. “Long-Distance Distribution of Qubit-Qubit Entanglement Using Gaussian-Correlated Photonic Beams.” Physical Review A, vol. 105, no. 6, 062454, American Physical Society, 2022, doi:10.1103/PhysRevA.105.062454.","ista":"Agustí J, Minoguchi Y, Fink JM, Rabl P. 2022. Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams. Physical Review A. 105(6), 062454.","chicago":"Agustí, J., Y. Minoguchi, Johannes M Fink, and P. Rabl. “Long-Distance Distribution of Qubit-Qubit Entanglement Using Gaussian-Correlated Photonic Beams.” Physical Review A. American Physical Society, 2022. https://doi.org/10.1103/PhysRevA.105.062454."},"title":"Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams","author":[{"first_name":"J.","last_name":"Agustí","full_name":"Agustí, J."},{"first_name":"Y.","last_name":"Minoguchi","full_name":"Minoguchi, Y."},{"id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","first_name":"Johannes M","last_name":"Fink","full_name":"Fink, Johannes M","orcid":"0000-0001-8112-028X"},{"first_name":"P.","last_name":"Rabl","full_name":"Rabl, P."}],"article_processing_charge":"No","external_id":{"arxiv":["2204.02993"],"isi":["000824330200003"]},"acknowledgement":"We thank T. Mavrogordatos and D. Zhu for initial contribution on the presented topic and K. Fedorov for stimulating discussions on entangled microwave beams. This work was supported by the Austrian Science Fund (FWF) through Grant No. P32299 (PHONED) and the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 899354 (SuperQuLAN). Most of the computational results presented were obtained using the CLIP cluster [65].","publisher":"American Physical Society","quality_controlled":"1","oa":1,"day":"29","publication":"Physical Review A","isi":1,"year":"2022","doi":"10.1103/PhysRevA.105.062454","date_published":"2022-06-29T00:00:00Z","date_created":"2022-07-17T22:01:55Z"},{"status":"public","type":"research_data_reference","tmp":{"image":"/images/cc_0.png","legal_code_url":"https://creativecommons.org/publicdomain/zero/1.0/legalcode","name":"Creative Commons Public Domain Dedication (CC0 1.0)","short":"CC0 (1.0)"},"_id":"14520","department":[{"_id":"JoFi"}],"title":"Compact vacuum gap transmon qubits: Selective and sensitive probes for superconductor surface losses","author":[{"first_name":"Martin","id":"2DCF8DE6-F248-11E8-B48F-1D18A9856A87","full_name":"Zemlicka, Martin","last_name":"Zemlicka"},{"full_name":"Redchenko, Elena","last_name":"Redchenko","id":"2C21D6E8-F248-11E8-B48F-1D18A9856A87","first_name":"Elena"},{"id":"3F920B30-F248-11E8-B48F-1D18A9856A87","first_name":"Matilda","orcid":"0000-0002-3415-4628","full_name":"Peruzzo, Matilda","last_name":"Peruzzo"},{"first_name":"Farid","id":"2AED110C-F248-11E8-B48F-1D18A9856A87","full_name":"Hassani, Farid","orcid":"0000-0001-6937-5773","last_name":"Hassani"},{"id":"42F71B44-F248-11E8-B48F-1D18A9856A87","first_name":"Andrea","full_name":"Trioni, Andrea","last_name":"Trioni"},{"last_name":"Barzanjeh","full_name":"Barzanjeh, Shabir","orcid":"0000-0003-0415-1423","first_name":"Shabir","id":"2D25E1F6-F248-11E8-B48F-1D18A9856A87"},{"id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","first_name":"Johannes M","last_name":"Fink","full_name":"Fink, Johannes M","orcid":"0000-0001-8112-028X"}],"article_processing_charge":"No","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","ddc":["530"],"citation":{"ista":"Zemlicka M, Redchenko E, Peruzzo M, Hassani F, Trioni A, Barzanjeh S, Fink JM. 2022. Compact vacuum gap transmon qubits: Selective and sensitive probes for superconductor surface losses, Zenodo, 10.5281/ZENODO.8408897.","chicago":"Zemlicka, Martin, Elena Redchenko, Matilda Peruzzo, Farid Hassani, Andrea Trioni, Shabir Barzanjeh, and Johannes M Fink. “Compact Vacuum Gap Transmon Qubits: Selective and Sensitive Probes for Superconductor Surface Losses.” Zenodo, 2022. https://doi.org/10.5281/ZENODO.8408897.","short":"M. Zemlicka, E. Redchenko, M. Peruzzo, F. Hassani, A. Trioni, S. Barzanjeh, J.M. Fink, (2022).","ieee":"M. Zemlicka et al., “Compact vacuum gap transmon qubits: Selective and sensitive probes for superconductor surface losses.” Zenodo, 2022.","ama":"Zemlicka M, Redchenko E, Peruzzo M, et al. Compact vacuum gap transmon qubits: Selective and sensitive probes for superconductor surface losses. 2022. doi:10.5281/ZENODO.8408897","apa":"Zemlicka, M., Redchenko, E., Peruzzo, M., Hassani, F., Trioni, A., Barzanjeh, S., & Fink, J. M. (2022). Compact vacuum gap transmon qubits: Selective and sensitive probes for superconductor surface losses. Zenodo. https://doi.org/10.5281/ZENODO.8408897","mla":"Zemlicka, Martin, et al. Compact Vacuum Gap Transmon Qubits: Selective and Sensitive Probes for Superconductor Surface Losses. Zenodo, 2022, doi:10.5281/ZENODO.8408897."},"date_updated":"2023-11-13T09:22:48Z","month":"06","publisher":"Zenodo","main_file_link":[{"open_access":"1","url":"https://doi.org/10.5281/ZENODO.8408897"}],"oa":1,"oa_version":"Published Version","abstract":[{"text":"This dataset comprises all data shown in the figures of the submitted article \"Compact vacuum gap transmon qubits: Selective and sensitive probes for superconductor surface losses\" at arxiv.org/abs/2206.14104. Additional raw data are available from the corresponding author on reasonable request.","lang":"eng"}],"doi":"10.5281/ZENODO.8408897","date_published":"2022-06-28T00:00:00Z","related_material":{"record":[{"id":"14517","status":"public","relation":"used_in_publication"}]},"license":"https://creativecommons.org/publicdomain/zero/1.0/","date_created":"2023-11-13T08:09:10Z","day":"28","has_accepted_license":"1","year":"2022"},{"oa":1,"publisher":"Institute of Science and Technology Austria","year":"2022","has_accepted_license":"1","day":"26","page":"168","date_created":"2023-01-25T09:17:02Z","date_published":"2022-09-26T00:00:00Z","doi":"10.15479/at:ista:12132","project":[{"call_identifier":"H2020","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","grant_number":"665385","name":"International IST Doctoral Program"},{"grant_number":"758053","name":"A Fiber Optic Transceiver for Superconducting Qubits","_id":"26336814-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"call_identifier":"H2020","_id":"237CBA6C-32DE-11EA-91FC-C7463DDC885E","grant_number":"862644","name":"Quantum readout techniques and technologies"}],"citation":{"ista":"Redchenko E. 2022. Controllable states of superconducting Qubit ensembles. Institute of Science and Technology Austria.","chicago":"Redchenko, Elena. “Controllable States of Superconducting Qubit Ensembles.” Institute of Science and Technology Austria, 2022. https://doi.org/10.15479/at:ista:12132.","ama":"Redchenko E. Controllable states of superconducting Qubit ensembles. 2022. doi:10.15479/at:ista:12132","apa":"Redchenko, E. (2022). Controllable states of superconducting Qubit ensembles. Institute of Science and Technology Austria. https://doi.org/10.15479/at:ista:12132","ieee":"E. Redchenko, “Controllable states of superconducting Qubit ensembles,” Institute of Science and Technology Austria, 2022.","short":"E. Redchenko, Controllable States of Superconducting Qubit Ensembles, Institute of Science and Technology Austria, 2022.","mla":"Redchenko, Elena. Controllable States of Superconducting Qubit Ensembles. Institute of Science and Technology Austria, 2022, doi:10.15479/at:ista:12132."},"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","article_processing_charge":"No","author":[{"id":"2C21D6E8-F248-11E8-B48F-1D18A9856A87","first_name":"Elena","last_name":"Redchenko","full_name":"Redchenko, Elena"}],"title":"Controllable states of superconducting Qubit ensembles","acknowledged_ssus":[{"_id":"NanoFab"},{"_id":"M-Shop"},{"_id":"EM-Fac"}],"abstract":[{"lang":"eng","text":"Recent substantial advances in the feld of superconducting circuits have shown its\r\npotential as a leading platform for future quantum computing. In contrast to classical\r\ncomputers based on bits that are represented by a single binary value, 0 or 1, quantum\r\nbits (or qubits) can be in a superposition of both. Thus, quantum computers can store\r\nand handle more information at the same time and a quantum advantage has already\r\nbeen demonstrated for two types of computational tasks. Rapid progress in academic\r\nand industry labs accelerates the development of superconducting processors which may\r\nsoon fnd applications in complex computations, chemical simulations, cryptography, and\r\noptimization. Now that these machines are scaled up to tackle such problems the questions\r\nof qubit interconnects and networks becomes very relevant. How to route signals on-chip\r\nbetween diferent processor components? What is the most efcient way to entangle\r\nqubits? And how to then send and process entangled signals between distant cryostats\r\nhosting superconducting processors?\r\nIn this thesis, we are looking for solutions to these problems by studying the collective\r\nbehavior of superconducting qubit ensembles. We frst demonstrate on-demand tunable\r\ndirectional scattering of microwave photons from a pair of qubits in a waveguide. Such a\r\ndevice can route microwave photons on-chip with a high diode efciency. Then we focus\r\non studying ultra-strong coupling regimes between light (microwave photons) and matter\r\n(superconducting qubits), a regime that could be promising for extremely fast multi-qubit\r\nentanglement generation. Finally, we show coherent pulse storage and periodic revivals\r\nin a fve qubit ensemble strongly coupled to a resonator. Such a reconfgurable storage\r\ndevice could be used as part of a quantum repeater that is needed for longer-distance\r\nquantum communication.\r\nThe achieved high degree of control over multi-qubit ensembles highlights not only the\r\nbeautiful physics of circuit quantum electrodynamics, it also represents the frst step\r\ntoward new quantum simulation and communication methods, and certain techniques\r\nmay also fnd applications in future superconducting quantum computing hardware.\r\n"}],"oa_version":"Published Version","alternative_title":["ISTA Thesis"],"month":"09","degree_awarded":"PhD","publication_status":"published","publication_identifier":{"issn":["2663-337X"],"isbn":["978-3-99078-024-4"]},"language":[{"iso":"eng"}],"file":[{"date_created":"2023-01-25T09:41:49Z","file_name":"Final_Thesis_ES_Redchenko.pdf","creator":"cchlebak","date_updated":"2023-01-26T23:30:44Z","file_size":56076868,"file_id":"12367","checksum":"39eabb1e006b41335f17f3b29af09648","embargo":"2022-12-28","access_level":"open_access","relation":"main_file","content_type":"application/pdf"}],"ec_funded":1,"_id":"12366","type":"dissertation","status":"public","date_updated":"2023-05-26T09:29:07Z","supervisor":[{"first_name":"Johannes M","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","full_name":"Fink, Johannes M","orcid":"0000-0001-8112-028X","last_name":"Fink"}],"ddc":["530"],"file_date_updated":"2023-01-26T23:30:44Z","department":[{"_id":"GradSch"},{"_id":"JoFi"}]},{"department":[{"_id":"JoFi"}],"title":"Qubit energy-relaxation statistics in the Bluefors quantum measurement system","author":[{"last_name":"Simbierowicz","full_name":"Simbierowicz, Slawomir","first_name":"Slawomir"},{"full_name":"Shi, Chunyan","last_name":"Shi","first_name":"Chunyan"},{"full_name":"Collodo, Michele","last_name":"Collodo","first_name":"Michele"},{"last_name":"Kirste","full_name":"Kirste, Moritz","first_name":"Moritz"},{"first_name":"Farid","id":"2AED110C-F248-11E8-B48F-1D18A9856A87","full_name":"Hassani, Farid","last_name":"Hassani"},{"first_name":"Johannes M","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","last_name":"Fink","orcid":"0000-0001-8112-028X","full_name":"Fink, Johannes M"},{"last_name":"Bylander","full_name":"Bylander, Jonas","first_name":"Jonas"},{"first_name":"Daniel","full_name":"Perez Lozano, Daniel","last_name":"Perez Lozano"},{"full_name":"Lake, Russell","last_name":"Lake","first_name":"Russell"}],"article_processing_charge":"No","user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","citation":{"mla":"Simbierowicz, Slawomir, et al. Qubit Energy-Relaxation Statistics in the Bluefors Quantum Measurement System. Bluefors Oy, 2021.","apa":"Simbierowicz, S., Shi, C., Collodo, M., Kirste, M., Hassani, F., Fink, J. M., … Lake, R. (2021). Qubit energy-relaxation statistics in the Bluefors quantum measurement system. Helsinki, Finland: Bluefors Oy.","ama":"Simbierowicz S, Shi C, Collodo M, et al. Qubit Energy-Relaxation Statistics in the Bluefors Quantum Measurement System. Helsinki, Finland: Bluefors Oy; 2021.","short":"S. Simbierowicz, C. Shi, M. Collodo, M. Kirste, F. Hassani, J.M. Fink, J. Bylander, D. Perez Lozano, R. Lake, Qubit Energy-Relaxation Statistics in the Bluefors Quantum Measurement System, Bluefors Oy, Helsinki, Finland, 2021.","ieee":"S. Simbierowicz et al., Qubit energy-relaxation statistics in the Bluefors quantum measurement system. Helsinki, Finland: Bluefors Oy, 2021.","chicago":"Simbierowicz, Slawomir, Chunyan Shi, Michele Collodo, Moritz Kirste, Farid Hassani, Johannes M Fink, Jonas Bylander, Daniel Perez Lozano, and Russell Lake. Qubit Energy-Relaxation Statistics in the Bluefors Quantum Measurement System. Helsinki, Finland: Bluefors Oy, 2021.","ista":"Simbierowicz S, Shi C, Collodo M, Kirste M, Hassani F, Fink JM, Bylander J, Perez Lozano D, Lake R. 2021. Qubit energy-relaxation statistics in the Bluefors quantum measurement system, Helsinki, Finland: Bluefors Oy, 8p."},"date_updated":"2022-01-19T09:11:39Z","status":"public","keyword":["Application note"],"type":"other_academic_publication","_id":"10645","date_published":"2021-06-03T00:00:00Z","date_created":"2022-01-19T08:41:14Z","page":"8","day":"03","language":[{"iso":"eng"}],"publication_status":"published","year":"2021","month":"06","place":"Helsinki, Finland","quality_controlled":"1","publisher":"Bluefors Oy","alternative_title":["Bluefors Blog"],"oa":1,"main_file_link":[{"url":"https://bluefors.com/blog/application-note-qubit-energy-relaxation-statistics-bluefors-quantum-measurement-system/","open_access":"1"}],"oa_version":"Published Version","abstract":[{"text":"Superconducting qubits have emerged as a highly versatile and useful platform for quantum technological applications [1]. Bluefors and Zurich Instruments have supported the growth of this field from the 2010s onwards by providing well-engineered and reliable measurement infrastructure [2]– [6]. Having a long and stable qubit lifetime is a critical system property. Therefore, considerable effort has already gone into measuring qubit energy-relaxation timescales and their fluctuations, see Refs. [7]–[10] among others. Accurately extracting the statistics of a quantum device requires users to perform time consuming measurements. One measurement challenge is that the detection of the state-dependent\r\nresponse of a superconducting resonator due to a dispersively-coupled qubit requires an inherently low signal level. Consequently, measurements must be performed using a microwave probe that contains only a few microwave photons. Improving the signal-to-noise ratio (SNR) by using near-quantum limited parametric amplifiers as well as the use of optimized signal processing enabled by efficient room temperature instrumentation help to reduce measurement time. An empirical observation for fixed frequency transmons from recent literature is that as the energy-relaxation time 𝑇𝑇1 increases, so do its natural temporal fluctuations [7], [10]. This necessitates many repeated measurements to understand the statistics (see for example, Ref. [10]). In addition, as state-of-the-art qubits increase in lifetime, longer\r\nmeasurement times are expected to obtain accurate statistics. As described below, the scaling of the widths of the qubit energy-relaxation distributions also reveal clues about the origin of the energy-relaxation.","lang":"eng"}]},{"citation":{"apa":"Lake, R., Simbierowicz, S., Krantz, P., Hassani, F., & Fink, J. M. (2021). The Bluefors dilution refrigerator as an integrated quantum measurement system. Helsinki, Finland: Bluefors Oy.","ama":"Lake R, Simbierowicz S, Krantz P, Hassani F, Fink JM. The Bluefors Dilution Refrigerator as an Integrated Quantum Measurement System. Helsinki, Finland: Bluefors Oy; 2021.","short":"R. Lake, S. Simbierowicz, P. Krantz, F. Hassani, J.M. Fink, The Bluefors Dilution Refrigerator as an Integrated Quantum Measurement System, Bluefors Oy, Helsinki, Finland, 2021.","ieee":"R. Lake, S. Simbierowicz, P. Krantz, F. Hassani, and J. M. Fink, The Bluefors dilution refrigerator as an integrated quantum measurement system. Helsinki, Finland: Bluefors Oy, 2021.","mla":"Lake, Russell, et al. The Bluefors Dilution Refrigerator as an Integrated Quantum Measurement System. Bluefors Oy, 2021.","ista":"Lake R, Simbierowicz S, Krantz P, Hassani F, Fink JM. 2021. The Bluefors dilution refrigerator as an integrated quantum measurement system, Helsinki, Finland: Bluefors Oy, 9p.","chicago":"Lake, Russell, Slawomir Simbierowicz, Philip Krantz, Farid Hassani, and Johannes M Fink. The Bluefors Dilution Refrigerator as an Integrated Quantum Measurement System. Helsinki, Finland: Bluefors Oy, 2021."},"date_updated":"2022-01-19T09:11:33Z","user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","article_processing_charge":"No","author":[{"first_name":"Russell","last_name":"Lake","full_name":"Lake, Russell"},{"first_name":"Slawomir","last_name":"Simbierowicz","full_name":"Simbierowicz, Slawomir"},{"first_name":"Philip","full_name":"Krantz, Philip","last_name":"Krantz"},{"full_name":"Hassani, Farid","last_name":"Hassani","id":"2AED110C-F248-11E8-B48F-1D18A9856A87","first_name":"Farid"},{"full_name":"Fink, Johannes M","orcid":"0000-0001-8112-028X","last_name":"Fink","first_name":"Johannes M","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87"}],"title":"The Bluefors dilution refrigerator as an integrated quantum measurement system","department":[{"_id":"JoFi"}],"_id":"10644","type":"other_academic_publication","keyword":["Application note"],"status":"public","year":"2021","publication_status":"published","language":[{"iso":"eng"}],"day":"20","page":"9","date_created":"2022-01-19T08:29:57Z","date_published":"2021-04-20T00:00:00Z","abstract":[{"lang":"eng","text":"The purpose of this application note is to demonstrate a working example of a superconducting qubit measurement in a Bluefors cryostat using the Keysight quantum control hardware. Our motivation is twofold. First, we provide pre-qualification data that the Bluefors cryostat, including filtering and wiring, can support long-lived qubits. Second, we demonstrate that the Keysight system (controlled using Labber) provides a straightforward solution to perform these characterization measurements. This document is intended as a brief guide for starting an experimental platform for testing superconducting qubits. The setup described here is an immediate jumping off point for a suite of applications including testing quantum logical gates, quantum optics with microwaves, or even using the qubit itself as a sensitive probe of local electromagnetic fields. Qubit measurements rely on high performance of both the physical sample environment and the measurement electronics. An overview of the cryogenic system is shown in Figure 1, and an overview of the integration between the electronics and cryostat (including wiring details) is shown in Figure 2."}],"oa_version":"Published Version","oa":1,"main_file_link":[{"url":"https://bluefors.com/blog/integrated-quantum-measurement-system/","open_access":"1"}],"quality_controlled":"1","alternative_title":["Bluefors Blog"],"publisher":"Bluefors Oy","place":"Helsinki, Finland","month":"04"}]