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Park JJ, Nha H. Fluctuation Theorem for Information Thermodynamics of Quantum Correlated Systems. ENTROPY (BASEL, SWITZERLAND) 2023; 25:165. [PMID: 36673305 PMCID: PMC9858563 DOI: 10.3390/e25010165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 01/10/2023] [Accepted: 01/11/2023] [Indexed: 06/17/2023]
Abstract
We establish a fluctuation theorem for an open quantum bipartite system that explicitly manifests the role played by quantum correlation. Generally quantum correlations may substantially modify the universality of classical thermodynamic relations in composite systems. Our fluctuation theorem finds a non-equilibrium parameter of genuinely quantum nature that sheds light on the emerging quantum information thermodynamics. Specifically we show that the statistics of quantum correlation fluctuation obtained in a time-reversed process can provide a useful insight into addressing work and heat in the resulting thermodynamic evolution. We illustrate these quantum thermodynamic relations by two examples of quantum correlated systems.
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Affiliation(s)
- Jung Jun Park
- School of Computational Sciences, Korea Institute for Advanced Study, Seoul 02455, Republic of Korea
| | - Hyunchul Nha
- School of Computational Sciences, Korea Institute for Advanced Study, Seoul 02455, Republic of Korea
- Department of Physics, Texas A&M University at Qatar, Education City, Doha 23874, Qatar
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Park J. Estimating Quantum Mutual Information of Continuous-Variable Quantum States by Measuring Purity and Covariance Matrix. ENTROPY 2022; 24:e24070940. [PMID: 35885164 PMCID: PMC9316791 DOI: 10.3390/e24070940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/24/2022] [Accepted: 07/04/2022] [Indexed: 12/07/2022]
Abstract
We derive accessible upper and lower bounds for continuous-variable (CV) quantum states on quantum mutual information. The derivations are based on the observation that some functions of purities bound the difference between quantum mutual information of a quantum state and its Gaussian reference. The bounds are efficiently obtainable by measuring purities and the covariance matrix without multimode quantum state reconstruction. We extend our approach to the upper and lower bounds for the quantum total correlation of CV multimode quantum states. Furthermore, we investigate the relations of the bounds for the quantum mutual information with the bounds for the quantum conditional entropy.
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Affiliation(s)
- Jiyong Park
- School of Basic Sciences, Hanbat National University, Daejeon 34158, Korea
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Micadei K, Peterson JPS, Souza AM, Sarthour RS, Oliveira IS, Landi GT, Serra RM, Lutz E. Experimental Validation of Fully Quantum Fluctuation Theorems Using Dynamic Bayesian Networks. PHYSICAL REVIEW LETTERS 2021; 127:180603. [PMID: 34767410 DOI: 10.1103/physrevlett.127.180603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 03/10/2021] [Accepted: 10/05/2021] [Indexed: 06/13/2023]
Abstract
Fluctuation theorems are fundamental extensions of the second law of thermodynamics for small systems. Their general validity arbitrarily far from equilibrium makes them invaluable in nonequilibrium physics. So far, experimental studies of quantum fluctuation relations do not account for quantum correlations and quantum coherence, two essential quantum properties. We here apply a novel dynamic Bayesian network approach to experimentally test detailed and integral fully quantum fluctuation theorems for heat exchange between two quantum-correlated thermal spins-1/2 in a nuclear magnetic resonance setup. We concretely verify individual integral fluctuation relations for quantum correlations and quantum coherence, as well as for the sum of all quantum contributions. We further investigate the thermodynamic cost of creating correlations and coherence.
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Affiliation(s)
- Kaonan Micadei
- Institute for Theoretical Physics I, University of Stuttgart, D-70550 Stuttgart, Germany
| | - John P S Peterson
- Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, Rio de Janeiro, Brazil
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo N2L 3G1, Ontario, Canada
| | - Alexandre M Souza
- Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, Rio de Janeiro, Brazil
| | - Roberto S Sarthour
- Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ivan S Oliveira
- Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gabriel T Landi
- Instituto de Física, Universidade de São Paulo, C.P. 66318, 05315-970 São Paulo, São Paolo, Brazil
| | - Roberto M Serra
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida dos Estados 5001, 09210-580 Santo André, São Paulo, Brazil
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - Eric Lutz
- Institute for Theoretical Physics I, University of Stuttgart, D-70550 Stuttgart, Germany
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