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Fluctuations in Extractable Work Bound the Charging Power of Quantum Batteries

Journal Article · · Physical Review Letters
 [1];  [2];  [3]
  1. Univ. of Maryland, College Park, MD (United States); Univ. of Massachusetts, Boston, MA (United States)
  2. Univ. of Massachusetts, Boston, MA (United States)
  3. Donostia International Physics Center, Bilbao (Spain); IKERBASQUE, Bilbao (Spain); Univ. of Massachusetts, Boston, MA (United States)

We study the connection between the charging power of quantum batteries and the fluctuations of the stored work. We prove that in order to have a non-zero rate of change of the extractable work, the state ρW of the battery cannot be an eigenstate of a `\emph{work operator}', defined by F ≡ HW + β-1log(ρW), where HW is the Hamiltonian of the battery and β is the inverse temperature of a reference thermal bath with respect to which the extractable work is calculated. We do so by proving that fluctuations in the stored work upper bound the charging power of a quantum battery. Our findings also suggest that quantum coherence in the battery enhances the charging process, which we illustrate on a toy model of a heat engine.

Research Organization:
Univ. of Maryland, College Park, MD (United States); University of Massachusetts, Lowell, MA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0019515
OSTI ID:
1644206
Alternate ID(s):
OSTI ID: 1657854
Journal Information:
Physical Review Letters, Vol. 125, Issue 4; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 54 works
Citation information provided by
Web of Science

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