Fluctuation theorems for a quantum channel

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Title: Fluctuation theorems for a quantum channel
Authors: Kwon, H
Kim, M
Item Type: Journal Article
Abstract: We establish the general framework of quantum fluctuation theorems by finding the symmetry between the forward and backward transitions of any given quantum channel. The Petz recovery map is adopted as the reverse quantum channel, and the notion of entropy production in thermodynamics is extended to the quantum regime. Our result shows that the fluctuation theorems, which are normally considered for thermodynamic processes, can be a powerful tool to study the detailed statistics of quantum systems as well as the effect of coherence transfer in an arbitrary non-equilibrium quantum process. We introduce a complex-valued entropy production to fully understand the relation between the forward and backward processes through the quantum channel. We find the physical meaning of the imaginary part of entropy production to witness the broken symmetry of the quantum channel. We also show that the imaginary part plays a crucial role in deriving the second law from the quantum fluctuation theorem. The dissipation and fluctuation of various quantum resources including quantum free energy, asymmetry and entanglement can be coherently understood in our unified framework. Our fluctuation theorem can be applied to a wide range of physical systems and dynamics to query the reversibility of a quantum state for the given quantum processing channel involving coherence and entanglement.
Issue Date: 20-Aug-2019
Date of Acceptance: 17-Jul-2019
URI: http://hdl.handle.net/10044/1/72231
ISSN: 2160-3308
Publisher: American Physical Society
Journal / Book Title: Physical Review X
Copyright Statement: This paper is embargoed until publication. Once published it will be available fully open access.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
The Royal Society
Samsung Electronics Co. Ltd
Korea Institute of Science and Technology
Funder's Grant Number: EP/R044082/1
Publication Status: Accepted
Embargo Date: publication subject to indefinite embargo
Appears in Collections:Quantum Optics and Laser Science

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