Charge-Preserving Operations in Quantum Batteries

• URL: http://arxiv.org/abs/2510.25549v1
• Date: Wed, 29 Oct 2025 14:17:29 GMT
• Title: Charge-Preserving Operations in Quantum Batteries
• Authors: André H. A. Malavazi, Borhan Ahmadi, Paweł Horodecki, Pedro R. Dieguez,
• Abstract summary: We introduce and formalize the concepts of isoergotropic states and ergotropy-preserving operations.<n>These ideas are illustrated for both discrete (two-level systems) and continuous-variable systems.<n>We show how ergotropy-preserving operations redistribute the respective coherent-incoherent and displacement-squeezing components.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Ergotropy provides a fundamental measure of the extractable work from a quantum system and, consequently, of the maximal useful energy, or charge, stored within it. Understanding how this quantity can be manipulated and transformed efficiently is crucial for advancing quantum energy management technologies. Here, we introduce and formalize the concepts of isoergotropic states and ergotropy-preserving operations, which reorganize the internal structure of ergotropy while keeping its total value unchanged. These ideas are illustrated for both discrete (two-level systems) and continuous-variable systems (single-mode Gaussian states). In each case, we show how ergotropy-preserving operations redistribute the respective coherent-incoherent and displacement-squeezing components. We further examine the thermodynamic exchanges accompanying ergotropy-preserving operations, including variations in energy and entropy, and demonstrate that these transformations can be dynamically implemented through standard beam-splitter-type interactions with an auxiliary system. Finally, we discuss the practical implications of isoergotropic states and operations in optimizing charging protocols and mitigating charge loss in open quantum batteries.

Related papers

• Ergotropy in Quantum Batteries [48.639104338064804]
  A key figure of merit for quantum battery (QB) performance, ergotropy plays a crucial role.<n>Here, we investigate the ergotropy of a general QB model and find that the charging process is accompanied by the variation and inversion of the energy level populations.<n>Our work establishes a rigorous framework for optimizing ergotropy and charging efficiency, paving the way for high-performance quantum energy-storage devices.
  arXiv  Detail & Related papers  (2025-12-26T04:35:36Z)
• Local and global approaches to the thermodynamics of pure decoherence processes in open quantum systems [44.99833362998488]
  We study the nonequilibrium thermodynamics of pure decoherence processes in open quantum systems coupled to a thermal reservoir.<n>Within local approaches thermodynamic quantities only refer to the open system's degrees of freedom, while in the global approaches certain quantities are defined by referring explicitly to the reservoir degrees of freedom.
  arXiv  Detail & Related papers  (2025-06-13T10:03:21Z)
• Physical consequences of Lindbladian invariance transformations [44.99833362998488]
  We show that symmetry transformations can be exploited, on their own, to optimize practical physical tasks. In particular, we show how they can be used to change the measurable values of physical quantities regarding the exchange of energy and/or information with the environment.
  arXiv  Detail & Related papers  (2024-07-02T18:22:11Z)
• Thermalization and Criticality on an Analog-Digital Quantum Simulator [133.58336306417294]
  We present a quantum simulator comprising 69 superconducting qubits which supports both universal quantum gates and high-fidelity analog evolution. We observe signatures of the classical Kosterlitz-Thouless phase transition, as well as strong deviations from Kibble-Zurek scaling predictions. We digitally prepare the system in pairwise-entangled dimer states and image the transport of energy and vorticity during thermalization.
  arXiv  Detail & Related papers  (2024-05-27T17:40:39Z)
• Qubit dynamics of ergotropy and environment-induced work [0.0]
  We investigate the dynamics of ergotropy in open systems under Markovian and non-Markovian evolutions. We use ergotropy as a resource for energy extraction in the form of work in an open-system scenario.
  arXiv  Detail & Related papers  (2024-03-07T17:47:03Z)
• Work extractability from energy eigenstates under optimized local operations [0.0]
  We examine the relationship between the second law of thermodynamics and the energy eigenstates of quantum many-body systems. We numerically demonstrate that such a strikingly different behavior can be attributed to the number of athermal energy eigenstates.
  arXiv  Detail & Related papers  (2023-08-07T12:34:09Z)
• Efficient Quantum Work Reservoirs at the Nanoscale [44.99833362998488]
  We show that two-level work reservoirs undershoot Landauer's bound, misleadingly implying energy dissipation during computation. In contrast, we demonstrate that multilevel work reservoirs achieve Landauer's bound while producing arbitrarily low entropy.
  arXiv  Detail & Related papers  (2023-05-28T21:52:33Z)
• Daemonic ergotropy in continuously-monitored open quantum batteries [0.0]
  daemonic ergotropy is introduced to properly describe and quantify this work extraction enhancement in the quantum regime. We 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.
  arXiv  Detail & Related papers  (2023-02-23T19:04:47Z)
• Indication of critical scaling in time during the relaxation of an open quantum system [34.82692226532414]
  Phase transitions correspond to the singular behavior of physical systems in response to continuous control parameters like temperature or external fields. Near continuous phase transitions, associated with the divergence of a correlation length, universal power-law scaling behavior with critical exponents independent of microscopic system details is found.
  arXiv  Detail & Related papers  (2022-08-10T05:59:14Z)
• Controlling the uncontrollable: Quantum control of open system dynamics [0.0]
  Control of open quantum systems is an essential ingredient to the realization of contemporary quantum science and technology. We demonstrate such control by employing a thermodynamically consistent framework, taking into account the fact that the drive can modify the interaction with environment.
  arXiv  Detail & Related papers  (2022-05-12T09:16:09Z)
• Gauge Quantum Thermodynamics of Time-local non-Markovian Evolutions [77.34726150561087]
  We deal with a generic time-local non-Markovian master equation. We define current and power to be process-dependent as in classical thermodynamics. Applying the theory to quantum thermal engines, we show that gauge transformations can change the machine efficiency.
  arXiv  Detail & Related papers  (2022-04-06T17:59:15Z)
• Quantum Coherence and Ergotropy [0.0]
  Constraints on work extraction are fundamental to our understanding of the thermodynamics of both classical and quantum systems. In the quantum setting, finite-time control operations generate coherence in the instantaneous energy eigenbasis of the dynamical system. We isolate and study the quantum coherent component to the work yield in such protocols.
  arXiv  Detail & Related papers  (2020-06-09T17:50:13Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.