Quantifying memory capacity as a quantum thermodynamic resource
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 thermodynam...
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sg-ntu-dr.10356-854222023-02-28T19:22:42Z Quantifying memory capacity as a quantum thermodynamic resource Narasimhachar, Varun Thompson, Jayne Ma, Jiajun Gour, Gilad Gu, Mile School of Physical and Mathematical Sciences Quantum Optics Memory Capacity DRNTU::Science::Physics 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. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2019-05-22T03:11:39Z 2019-12-06T16:03:30Z 2019-05-22T03:11:39Z 2019-12-06T16:03:30Z 2019 Journal Article 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 0031-9007 https://hdl.handle.net/10356/85422 http://hdl.handle.net/10220/48311 10.1103/PhysRevLett.122.060601 en Physical Review Letters © 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. 6 p. application/pdf |
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Quantum Optics Memory Capacity DRNTU::Science::Physics Narasimhachar, Varun Thompson, Jayne Ma, Jiajun Gour, Gilad Gu, Mile Quantifying memory capacity as a quantum thermodynamic resource |
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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. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Narasimhachar, Varun Thompson, Jayne Ma, Jiajun Gour, Gilad Gu, Mile |
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Article |
author |
Narasimhachar, Varun Thompson, Jayne Ma, Jiajun Gour, Gilad Gu, Mile |
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Narasimhachar, Varun |
title |
Quantifying memory capacity as a quantum thermodynamic resource |
title_short |
Quantifying memory capacity as a quantum thermodynamic resource |
title_full |
Quantifying memory capacity as a quantum thermodynamic resource |
title_fullStr |
Quantifying memory capacity as a quantum thermodynamic resource |
title_full_unstemmed |
Quantifying memory capacity as a quantum thermodynamic resource |
title_sort |
quantifying memory capacity as a quantum thermodynamic resource |
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2019 |
url |
https://hdl.handle.net/10356/85422 http://hdl.handle.net/10220/48311 |
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1759853910643703808 |