--- _id: '9011' abstract: - lang: eng text: "Distributed ledgers provide high availability and integrity, making them a key enabler for practical and secure computation of distributed workloads among mutually distrustful parties. Many practical applications also require strong confidentiality, however. This work enhances permissioned and permissionless blockchains with the ability to manage confidential data without forfeiting availability or decentralization. The proposed Calypso architecture addresses two orthogonal challenges confronting modern distributed ledgers: (a) enabling the auditable management of secrets and (b) protecting distributed computations against arbitrage attacks when their results depend on the ordering and secrecy of inputs.\r\n\r\nCalypso introduces on-chain secrets, a novel abstraction that enforces atomic deposition of an auditable trace whenever users access confidential data. Calypso provides user-controlled consent management that ensures revocation atomicity and accountable anonymity. To enable permissionless deployment, we introduce an incentive scheme and provide users with the option to select their preferred trustees. We evaluated our Calypso prototype with a confidential document-sharing application and a decentralized lottery. Our benchmarks show that transaction-processing latency increases linearly in terms of security (number of trustees) and is in the range of 0.2 to 8 seconds for 16 to 128 trustees." acknowledgement: 'We thank Nicolas Gailly, Vincent Graf, Jean-Pierre Hubaux, Wouter Lueks, Massimo Marelli, Carmela Troncoso, Juan-Ramón Troncoso Pastoriza, Frédéric Pont, and Sandra Siby for their valuable feedback. This project was supported in part by the ETH domain under PHRT grant #2017−201, and by the AXA Research Fund, Byzgen, DFINITY, and the Swiss Data Science Center (SDSC).' article_processing_charge: No article_type: original author: - first_name: Eleftherios full_name: Kokoris Kogias, Eleftherios id: f5983044-d7ef-11ea-ac6d-fd1430a26d30 last_name: Kokoris Kogias - first_name: Enis Ceyhun full_name: Alp, Enis Ceyhun last_name: Alp - first_name: Linus full_name: Gasser, Linus last_name: Gasser - first_name: Philipp full_name: Jovanovic, Philipp last_name: Jovanovic - first_name: Ewa full_name: Syta, Ewa last_name: Syta - first_name: Bryan full_name: Ford, Bryan last_name: Ford citation: ama: 'Kokoris Kogias E, Alp EC, Gasser L, Jovanovic P, Syta E, Ford B. CALYPSO: Private data management for decentralized ledgers. Proceedings of the VLDB Endowment. 2020;14(4):586-599. doi:10.14778/3436905.3436917' apa: 'Kokoris Kogias, E., Alp, E. C., Gasser, L., Jovanovic, P., Syta, E., & Ford, B. (2020). CALYPSO: Private data management for decentralized ledgers. Proceedings of the VLDB Endowment. Association for Computing Machinery. https://doi.org/10.14778/3436905.3436917' chicago: 'Kokoris Kogias, Eleftherios, Enis Ceyhun Alp, Linus Gasser, Philipp Jovanovic, Ewa Syta, and Bryan Ford. “CALYPSO: Private Data Management for Decentralized Ledgers.” Proceedings of the VLDB Endowment. Association for Computing Machinery, 2020. https://doi.org/10.14778/3436905.3436917.' ieee: 'E. Kokoris Kogias, E. C. Alp, L. Gasser, P. Jovanovic, E. Syta, and B. Ford, “CALYPSO: Private data management for decentralized ledgers,” Proceedings of the VLDB Endowment, vol. 14, no. 4. Association for Computing Machinery, pp. 586–599, 2020.' ista: 'Kokoris Kogias E, Alp EC, Gasser L, Jovanovic P, Syta E, Ford B. 2020. CALYPSO: Private data management for decentralized ledgers. Proceedings of the VLDB Endowment. 14(4), 586–599.' mla: 'Kokoris Kogias, Eleftherios, et al. “CALYPSO: Private Data Management for Decentralized Ledgers.” Proceedings of the VLDB Endowment, vol. 14, no. 4, Association for Computing Machinery, 2020, pp. 586–99, doi:10.14778/3436905.3436917.' short: E. Kokoris Kogias, E.C. Alp, L. Gasser, P. Jovanovic, E. Syta, B. Ford, Proceedings of the VLDB Endowment 14 (2020) 586–599. date_created: 2021-01-17T23:01:13Z date_published: 2020-12-01T00:00:00Z date_updated: 2023-08-24T13:57:13Z day: '01' department: - _id: ElKo doi: 10.14778/3436905.3436917 external_id: isi: - '000658495400012' intvolume: ' 14' isi: 1 issue: '4' language: - iso: eng license: https://creativecommons.org/licenses/by-nc-nd/4.0/ main_file_link: - open_access: '1' url: https://dl.acm.org/doi/10.14778/3436905.3436917 month: '12' oa: 1 oa_version: Published Version page: 586-599 publication: Proceedings of the VLDB Endowment publication_identifier: eissn: - 2150-8097 publication_status: published publisher: Association for Computing Machinery quality_controlled: '1' scopus_import: '1' status: public title: 'CALYPSO: Private data management for decentralized ledgers' tmp: image: /images/cc_by_nc_nd.png legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) short: CC BY-NC-ND (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 14 year: '2020' ... --- _id: '8308' abstract: - lang: eng text: 'Many-body localization provides a mechanism to avoid thermalization in isolated interacting quantum systems. The breakdown of thermalization may be complete, when all eigenstates in the many-body spectrum become localized, or partial, when the so-called many-body mobility edge separates localized and delocalized parts of the spectrum. Previously, De Roeck et al. [Phys. Rev. B 93, 014203 (2016)] suggested a possible instability of the many-body mobility edge in energy density. The local ergodic regions—so-called “bubbles”—resonantly spread throughout the system, leading to delocalization. In order to study such instability mechanism, in this work we design a model featuring many-body mobility edge in particle density: the states at small particle density are localized, while increasing the density of particles leads to delocalization. Using numerical simulations with matrix product states, we demonstrate the stability of many-body localization with respect to small bubbles in large dilute systems for experimentally relevant timescales. In addition, we demonstrate that processes where the bubble spreads are favored over processes that lead to resonant tunneling, suggesting a possible mechanism behind the observed stability of many-body mobility edge. We conclude by proposing experiments to probe particle density mobility edge in the Bose-Hubbard model.' acknowledgement: 'Acknowledgments. We acknowledge useful discussions with W. De Roeck and A. Michailidis. P.B. was supported by the European Union''s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No. 665385. D.A. was supported by the Swiss National Science Foundation. M.S. was supported by European Research Council (ERC) under the European Union''s Horizon 2020 research and innovation program (Grant Agreement No. 850899). This work benefited from visits to KITP, supported by the National Science Foundation under Grant No. NSF PHY-1748958 and from the program “Thermalization, Many Body Localization and Hydrodynamics” at International Centre for Theoretical Sciences (Code: ICTS/hydrodynamics2019/11).' article_number: 060202(R) article_processing_charge: No article_type: original author: - first_name: Pietro full_name: Brighi, Pietro id: 4115AF5C-F248-11E8-B48F-1D18A9856A87 last_name: Brighi orcid: 0000-0002-7969-2729 - first_name: Dmitry A. full_name: Abanin, Dmitry A. last_name: Abanin - first_name: Maksym full_name: Serbyn, Maksym id: 47809E7E-F248-11E8-B48F-1D18A9856A87 last_name: Serbyn orcid: 0000-0002-2399-5827 citation: ama: Brighi P, Abanin DA, Serbyn M. Stability of mobility edges in disordered interacting systems. Physical Review B. 2020;102(6). doi:10.1103/physrevb.102.060202 apa: Brighi, P., Abanin, D. A., & Serbyn, M. (2020). Stability of mobility edges in disordered interacting systems. Physical Review B. American Physical Society. https://doi.org/10.1103/physrevb.102.060202 chicago: Brighi, Pietro, Dmitry A. Abanin, and Maksym Serbyn. “Stability of Mobility Edges in Disordered Interacting Systems.” Physical Review B. American Physical Society, 2020. https://doi.org/10.1103/physrevb.102.060202. ieee: P. Brighi, D. A. Abanin, and M. Serbyn, “Stability of mobility edges in disordered interacting systems,” Physical Review B, vol. 102, no. 6. American Physical Society, 2020. ista: Brighi P, Abanin DA, Serbyn M. 2020. Stability of mobility edges in disordered interacting systems. Physical Review B. 102(6), 060202(R). mla: Brighi, Pietro, et al. “Stability of Mobility Edges in Disordered Interacting Systems.” Physical Review B, vol. 102, no. 6, 060202(R), American Physical Society, 2020, doi:10.1103/physrevb.102.060202. short: P. Brighi, D.A. Abanin, M. Serbyn, Physical Review B 102 (2020). date_created: 2020-08-26T19:27:42Z date_published: 2020-08-26T00:00:00Z date_updated: 2023-08-24T14:20:21Z day: '26' ddc: - '530' department: - _id: MaSe doi: 10.1103/physrevb.102.060202 ec_funded: 1 external_id: isi: - '000562628300001' file: - access_level: open_access checksum: 716442fa7861323fcc80b93718ca009c content_type: application/pdf creator: mserbyn date_created: 2020-08-26T19:28:55Z date_updated: 2020-08-26T19:28:55Z file_id: '8309' file_name: PhysRevB.102.060202.pdf file_size: 488825 relation: main_file success: 1 - access_level: open_access checksum: be0abdc8f60fe065ea6dc92e08487122 content_type: application/pdf creator: mserbyn date_created: 2020-08-26T19:29:00Z date_updated: 2020-08-26T19:29:00Z file_id: '8310' file_name: Supplementary-mbme.pdf file_size: 711405 relation: main_file success: 1 file_date_updated: 2020-08-26T19:29:00Z has_accepted_license: '1' intvolume: ' 102' isi: 1 issue: '6' language: - iso: eng month: '08' oa: 1 oa_version: None project: - _id: 2564DBCA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '665385' name: International IST Doctoral Program - _id: 23841C26-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '850899' name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control' publication: Physical Review B publication_identifier: eissn: - 2469-9969 issn: - 2469-9950 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: record: - id: '12732' relation: dissertation_contains status: public scopus_import: '1' status: public title: Stability of mobility edges in disordered interacting systems type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 102 year: '2020' ... --- _id: '10862' abstract: - lang: eng text: We consider the sum of two large Hermitian matrices A and B with a Haar unitary conjugation bringing them into a general relative position. We prove that the eigenvalue density on the scale slightly above the local eigenvalue spacing is asymptotically given by the free additive convolution of the laws of A and B as the dimension of the matrix increases. This implies optimal rigidity of the eigenvalues and optimal rate of convergence in Voiculescu's theorem. Our previous works [4], [5] established these results in the bulk spectrum, the current paper completely settles the problem at the spectral edges provided they have the typical square-root behavior. The key element of our proof is to compensate the deterioration of the stability of the subordination equations by sharp error estimates that properly account for the local density near the edge. Our results also hold if the Haar unitary matrix is replaced by the Haar orthogonal matrix. acknowledgement: Partially supported by ERC Advanced Grant RANMAT No. 338804. article_number: '108639' article_processing_charge: No article_type: original author: - first_name: Zhigang full_name: Bao, Zhigang id: 442E6A6C-F248-11E8-B48F-1D18A9856A87 last_name: Bao orcid: 0000-0003-3036-1475 - first_name: László full_name: Erdös, László id: 4DBD5372-F248-11E8-B48F-1D18A9856A87 last_name: Erdös orcid: 0000-0001-5366-9603 - first_name: Kevin full_name: Schnelli, Kevin last_name: Schnelli citation: ama: Bao Z, Erdös L, Schnelli K. Spectral rigidity for addition of random matrices at the regular edge. Journal of Functional Analysis. 2020;279(7). doi:10.1016/j.jfa.2020.108639 apa: Bao, Z., Erdös, L., & Schnelli, K. (2020). Spectral rigidity for addition of random matrices at the regular edge. Journal of Functional Analysis. Elsevier. https://doi.org/10.1016/j.jfa.2020.108639 chicago: Bao, Zhigang, László Erdös, and Kevin Schnelli. “Spectral Rigidity for Addition of Random Matrices at the Regular Edge.” Journal of Functional Analysis. Elsevier, 2020. https://doi.org/10.1016/j.jfa.2020.108639. ieee: Z. Bao, L. Erdös, and K. Schnelli, “Spectral rigidity for addition of random matrices at the regular edge,” Journal of Functional Analysis, vol. 279, no. 7. Elsevier, 2020. ista: Bao Z, Erdös L, Schnelli K. 2020. Spectral rigidity for addition of random matrices at the regular edge. Journal of Functional Analysis. 279(7), 108639. mla: Bao, Zhigang, et al. “Spectral Rigidity for Addition of Random Matrices at the Regular Edge.” Journal of Functional Analysis, vol. 279, no. 7, 108639, Elsevier, 2020, doi:10.1016/j.jfa.2020.108639. short: Z. Bao, L. Erdös, K. Schnelli, Journal of Functional Analysis 279 (2020). date_created: 2022-03-18T10:18:59Z date_published: 2020-10-15T00:00:00Z date_updated: 2023-08-24T14:08:42Z day: '15' department: - _id: LaEr doi: 10.1016/j.jfa.2020.108639 ec_funded: 1 external_id: arxiv: - '1708.01597' isi: - '000559623200009' intvolume: ' 279' isi: 1 issue: '7' keyword: - Analysis language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1708.01597 month: '10' oa: 1 oa_version: Preprint project: - _id: 258DCDE6-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '338804' name: Random matrices, universality and disordered quantum systems publication: Journal of Functional Analysis publication_identifier: issn: - 0022-1236 publication_status: published publisher: Elsevier quality_controlled: '1' scopus_import: '1' status: public title: Spectral rigidity for addition of random matrices at the regular edge type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 279 year: '2020' ... --- _id: '10867' abstract: - lang: eng text: In this paper we find a tight estimate for Gromov’s waist of the balls in spaces of constant curvature, deduce the estimates for the balls in Riemannian manifolds with upper bounds on the curvature (CAT(ϰ)-spaces), and establish similar result for normed spaces. acknowledgement: ' Supported by the Russian Foundation for Basic Research grant 18-01-00036.' article_processing_charge: No article_type: original author: - first_name: Arseniy full_name: Akopyan, Arseniy id: 430D2C90-F248-11E8-B48F-1D18A9856A87 last_name: Akopyan orcid: 0000-0002-2548-617X - first_name: Roman full_name: Karasev, Roman last_name: Karasev citation: ama: Akopyan A, Karasev R. Waist of balls in hyperbolic and spherical spaces. International Mathematics Research Notices. 2020;2020(3):669-697. doi:10.1093/imrn/rny037 apa: Akopyan, A., & Karasev, R. (2020). Waist of balls in hyperbolic and spherical spaces. International Mathematics Research Notices. Oxford University Press. https://doi.org/10.1093/imrn/rny037 chicago: Akopyan, Arseniy, and Roman Karasev. “Waist of Balls in Hyperbolic and Spherical Spaces.” International Mathematics Research Notices. Oxford University Press, 2020. https://doi.org/10.1093/imrn/rny037. ieee: A. Akopyan and R. Karasev, “Waist of balls in hyperbolic and spherical spaces,” International Mathematics Research Notices, vol. 2020, no. 3. Oxford University Press, pp. 669–697, 2020. ista: Akopyan A, Karasev R. 2020. Waist of balls in hyperbolic and spherical spaces. International Mathematics Research Notices. 2020(3), 669–697. mla: Akopyan, Arseniy, and Roman Karasev. “Waist of Balls in Hyperbolic and Spherical Spaces.” International Mathematics Research Notices, vol. 2020, no. 3, Oxford University Press, 2020, pp. 669–97, doi:10.1093/imrn/rny037. short: A. Akopyan, R. Karasev, International Mathematics Research Notices 2020 (2020) 669–697. date_created: 2022-03-18T11:39:30Z date_published: 2020-02-01T00:00:00Z date_updated: 2023-08-24T14:19:55Z day: '01' department: - _id: HeEd doi: 10.1093/imrn/rny037 external_id: arxiv: - '1702.07513' isi: - '000522852700002' intvolume: ' 2020' isi: 1 issue: '3' keyword: - General Mathematics language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1702.07513 month: '02' oa: 1 oa_version: Preprint page: 669-697 publication: International Mathematics Research Notices publication_identifier: eissn: - 1687-0247 issn: - 1073-7928 publication_status: published publisher: Oxford University Press quality_controlled: '1' scopus_import: '1' status: public title: Waist of balls in hyperbolic and spherical spaces type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 2020 year: '2020' ... --- _id: '9799' abstract: - lang: eng text: Fitness interactions between mutations can influence a population’s evolution in many different ways. While epistatic effects are difficult to measure precisely, important information is captured by the mean and variance of log fitnesses for individuals carrying different numbers of mutations. We derive predictions for these quantities from a class of simple fitness landscapes, based on models of optimizing selection on quantitative traits. We also explore extensions to the models, including modular pleiotropy, variable effect sizes, mutational bias and maladaptation of the wild type. We illustrate our approach by reanalysing a large dataset of mutant effects in a yeast snoRNA. Though characterized by some large epistatic effects, these data give a good overall fit to the non-epistatic null model, suggesting that epistasis might have limited influence on the evolutionary dynamics in this system. We also show how the amount of epistasis depends on both the underlying fitness landscape and the distribution of mutations, and so is expected to vary in consistent ways between new mutations, standing variation and fixed mutations. article_processing_charge: No author: - first_name: Christelle full_name: Fraisse, Christelle id: 32DF5794-F248-11E8-B48F-1D18A9856A87 last_name: Fraisse orcid: 0000-0001-8441-5075 - first_name: John J. full_name: Welch, John J. last_name: Welch citation: ama: Fraisse C, Welch JJ. Simulation code for Fig S1 from the distribution of epistasis on simple fitness landscapes. 2020. doi:10.6084/m9.figshare.7957469.v1 apa: Fraisse, C., & Welch, J. J. (2020). Simulation code for Fig S1 from the distribution of epistasis on simple fitness landscapes. Royal Society of London. https://doi.org/10.6084/m9.figshare.7957469.v1 chicago: Fraisse, Christelle, and John J. Welch. “Simulation Code for Fig S1 from the Distribution of Epistasis on Simple Fitness Landscapes.” Royal Society of London, 2020. https://doi.org/10.6084/m9.figshare.7957469.v1. ieee: C. Fraisse and J. J. Welch, “Simulation code for Fig S1 from the distribution of epistasis on simple fitness landscapes.” Royal Society of London, 2020. ista: Fraisse C, Welch JJ. 2020. Simulation code for Fig S1 from the distribution of epistasis on simple fitness landscapes, Royal Society of London, 10.6084/m9.figshare.7957469.v1. mla: Fraisse, Christelle, and John J. Welch. Simulation Code for Fig S1 from the Distribution of Epistasis on Simple Fitness Landscapes. Royal Society of London, 2020, doi:10.6084/m9.figshare.7957469.v1. short: C. Fraisse, J.J. Welch, (2020). date_created: 2021-08-06T11:26:57Z date_published: 2020-10-15T00:00:00Z date_updated: 2023-08-25T10:34:41Z day: '15' department: - _id: BeVi - _id: NiBa doi: 10.6084/m9.figshare.7957469.v1 main_file_link: - open_access: '1' url: https://doi.org/10.6084/m9.figshare.7957469.v1 month: '10' oa: 1 oa_version: Published Version publisher: Royal Society of London related_material: record: - id: '6467' relation: used_in_publication status: public status: public title: Simulation code for Fig S1 from the distribution of epistasis on simple fitness landscapes type: research_data_reference user_id: 6785fbc1-c503-11eb-8a32-93094b40e1cf year: '2020' ...