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Title: Quantifying memory capacity as a quantum thermodynamic resource
Authors: Narasimhachar, Varun
Thompson, Jayne
Ma, Jiajun
Gour, Gilad
Gu, Mile
Keywords: Quantum Optics
Memory Capacity
Issue Date: 2019
Source: Narasimhachar, V., Thompson, J., Ma, J., Gour, G., & Gu, M. (2019). Quantifying memory capacity as a quantum thermodynamic resource. Physical Review Letters, 122(6), 060601-. doi:10.1103/PhysRevLett.122.060601
Series/Report no.: Physical Review Letters
Abstract: The information-carrying capacity of a memory is known to be a thermodynamic resource facilitating the conversion of heat to work. Szilard's engine explicates this connection through a toy example involving an energy-degenerate two-state memory. We devise a formalism to quantify the thermodynamic value of memory in general quantum systems with nontrivial energy landscapes. Calling this the thermal information capacity, we show that it converges to the nonequilibrium Helmholtz free energy in the thermodynamic limit. We compute the capacity exactly for a general two-state (qubit) memory away from the thermodynamic limit, and find it to be distinct from known free energies. We outline an explicit memory-bath coupling that can approximate the optimal qubit thermal information capacity arbitrarily well.
ISSN: 0031-9007
Rights: © 2019 American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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