Optimal work extraction from quantum batteries based on the expected utility hypothesis

Abstract

Work extraction in quantum finite systems is an important issue in quantum thermodynamics. The optimal work extracted is called ergotropy, and it is achieved by maximizing the average work extracted over all the unitary cycles. However, an agent that is non-neutral to risk is affected by fluctuations and should extract work by following the expected utility hypothesis. Thus, we investigate the optimal work extraction performed by a risk non-neutral agent by maximizing the average utility function over all the unitary cycles. We mainly focus on initial states that are incoherent with respect to the energy basis, achieving a probability distribution of work. In this case we show how the optimal work extraction will be performed with an incoherent unitary transformation, namely a permutation of the energy basis, which depends on the risk aversion of the agent. We give several examples, in particular also the work extraction from an ensemble of quantum batteries is examined. Furthermore, we also investigate how work extraction is affected by the presence of initial quantum coherence in the energy basis by considering a quasiprobability distribution of work.

arXiv comment14 pages, 4 figures

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• Topological Quantum Batteries
• Quantum advantage in batteries for Sachdev-Ye-Kitaev interactions
• Role of quantum correlations in daemonic expected utility
• Zero-Fluctuation Quantum Work Extraction
• Resource theories with completely passive states and passive states as free states
• The evolution of quantum battery capacity of GHZ-like states under Markovian channels
• Quantum advantage from negativity of a work quasiprobability distribution