Comment on "Fluctuations in Extractable Work Bound the Charging Power of Quantum Batteries"

Abstract

In the abstract of~[Phys. Rev. Lett. {\bf 125}, 040601 (2020)] one can read that: [...]{\it to have a nonzero rate of change of the extractable work, the state ${\rho }_{\mathcal{W}}$ of the battery cannot be an eigenstate of a "free energy operator", defined by $\mathcal{F}=H_{\mathcal{W}}+{\beta }^{-1}\log {\rho }_{\mathcal{W}}$, where $H_{\mathcal{W}}$ is the Hamiltonian of the battery and $\beta$ is the inverse temperature} [...]. Contrarily to what is presented below Eq.~(17) of the paper, we observe that the above conclusion does not hold when the battery is subject to nonunitary dynamics.

arXiv comment1 page, submitted to the journal the 23rd of December 2020

References in corpus (2)

• Fluctuations in extractable work bound the charging power of quantum batteries
• Fundamental limits on quantum dynamics based on entropy change

Cited by in corpus (5)

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• Trade-offs between precision and fluctuations in charging finite-dimensional quantum batteries
• Fluctuations in Extractable Work and Bounds on the Charging Power of Quantum Batteries