Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Fluctuations in Extractable Work Bound the Charging Power of
  Quantum Batteries"   In an article by Garc\'ia-Pintos et al. [Rev. Lett. 125, 040601 (2020)] the
connection between the charging power of a quantum battery and the fluctuations
of a "free energy operator" whose expectation value characterizes the maximum
extractable work of the battery is studied. The result of the closed-system
analysis shows that for a general charging process the battery will have a
nonzero charging power if and only if the state of the battery is not an
eigenstate of the free energy operator. In this Comment, we point out a few
mistakes in the analysis and obtain the correct bound on the charging power.
Consequently, the result for closed-system dynamics is in general not correct.

33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th