Daemonic ergotropy in continuously monitored open quantum batteries
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-10
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en
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11
1-11
1-11
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Physical Review Applied, Volume 20, issue 4
Abstract
The amount of work that can be extracted from a quantum system can be increased by exploiting the information obtained from a measurement performed on a correlated ancillary system. The concept of daemonic ergotropy has been introduced to properly describe and quantify this work extraction enhancement in the quantum regime. We here explore the application of this idea in the context of continuously monitored open quantum systems, where information is gained by measuring the environment interacting with the energy-storing quantum device. We first show that the corresponding daemonic ergotropy takes values between the ergotropy and the energy of the corresponding unconditional state. The upper bound is achieved by assuming an initial pure state and a perfectly efficient projective measurement on the environment, independently of the kind of measurement performed. On the other hand, if the measurement is inefficient or the initial state is mixed, the daemonic ergotropy is generally dependent on the measurement strategy. This scenario is investigated via a paradigmatic example of an open quantum battery: a two-level atom driven by a classical field and whose spontaneously emitted photons are continuously monitored via either homodyne, heterodyne, or photodetection.Description
Funding Information: The authors acknowledge helpful discussions with F. Albarelli, A. Serafini, and A. Smirne. D.M. acknowledges financial support from MUR under the “PON Ricerca e Innovazione 2014-2020.” M.A.C.R. acknowledges financial support from the Academy of Finland via the Centre of Excellence program (Project No. 336810). M.G.G. acknowledges support from UniMi via PSR-2 2021. The authors wish to acknowledge CSC—IT Center for Science, Finland, for computational resources. Publisher Copyright: © 2023 American Physical Society.
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Morrone, D, Rossi, M A C & Genoni, M G 2023, ' Daemonic ergotropy in continuously monitored open quantum batteries ', Physical Review Applied, vol. 20, no. 4, 044073, pp. 1-11 . https://doi.org/10.1103/PhysRevApplied.20.044073