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Title: Thermodynamic Capacity of Quantum Processes

Journal Article · · Physical Review Letters
 [1];  [2];  [3]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States)
  2. Imperial College, London (United Kingdom)
  3. Google Inc., Venice, CA (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)

Thermodynamics imposes restrictions on what state transformations are possible. In the macroscopic limit of asymptotically many independent copies of a state—as for instance in the case of an ideal gas—the possible transformations become reversible and are fully characterized by the free energy. In this Letter, we present a thermodynamic resource theory for quantum processes that also becomes reversible in the macroscopic limit, a property that is especially rare for a resource theory of quantum channels. We identify a unique single-letter and additive quantity, the thermodynamic capacity, that characterizes the “thermodynamic value” of a quantum channel, in the sense that the work required to simulate many repetitions of a quantum process employing many repetitions of another quantum process becomes equal to the difference of the respective thermodynamic capacities. On a technical level, we provide asymptotically optimal constructions of universal implementations of quantum processes. A challenging aspect of this construction is the apparent necessity to coherently combine thermal engines that would run in different thermodynamic regimes depending on the input state. Furthermore, our results have applications in quantum Shannon theory by providing a generalized notion of quantum typical subspaces and by giving an operational interpretation to the entropy difference of a channel.

Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0018407
OSTI ID:
1612968
Alternate ID(s):
OSTI ID: 1515591
Journal Information:
Physical Review Letters, Vol. 122, Issue 20; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (9)

Quantum conditional relative entropy and quasi-factorization of the relative entropy journal November 2018
Asymptotic Reversibility of Thermal Operations for Interacting Quantum Spin Systems via Generalized Quantum Stein's Lemma text January 2019
An introductory review of the resource theory approach to thermodynamics text January 2018
Dependence of integrated, instantaneous, and fluctuating entropy production on the initial state in quantum and classical processes journal November 2021
No second law of entanglement manipulation after all text January 2021
Coherence cost for violating conservation laws journal December 2020
Preprocessing operations and the reverse compression preprint January 2021
An introductory review of the resource theory approach to thermodynamics journal October 2019
Computing Quantum Channel Capacities text January 2019

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