In the abstract of [Phys. Rev. Lett. 125, 040601 (2020)] one can read that “[…] to have a nonzero rate of change of the extractable work, the state ρW of the battery cannot be an eigenstate of a ‘free energy operator,’ defined by F≡HW+β−1log(ρW), where HW is the Hamiltonian of the battery and β is the inverse temperature […].” Contrarily to what is presented below Eq. (17) of the Letter, we observe that the above conclusion does not hold when the battery is subject to nonunitary dynamics.
Comment on ``Fluctuations in Extractable Work Bound the Charging Power of Quantum Batteries'' / Cusumano, S; Rudnicki, Ł. - In: PHYSICAL REVIEW LETTERS. - ISSN 1092-0145. - 127:2(2021). [10.1103/PhysRevLett.127.028901]
Comment on ``Fluctuations in Extractable Work Bound the Charging Power of Quantum Batteries''
Cusumano S;
2021
Abstract
In the abstract of [Phys. Rev. Lett. 125, 040601 (2020)] one can read that “[…] to have a nonzero rate of change of the extractable work, the state ρW of the battery cannot be an eigenstate of a ‘free energy operator,’ defined by F≡HW+β−1log(ρW), where HW is the Hamiltonian of the battery and β is the inverse temperature […].” Contrarily to what is presented below Eq. (17) of the Letter, we observe that the above conclusion does not hold when the battery is subject to nonunitary dynamics.| File | Dimensione | Formato | |
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