Asymptotic freedom of dephased charging

• URL: http://arxiv.org/abs/2508.13497v1
• Date: Tue, 19 Aug 2025 04:11:35 GMT
• Title: Asymptotic freedom of dephased charging
• Authors: Chayan Purkait, B. Prasanna Venkatesh, Gentaro Watanabe,
• Abstract summary: We study the collective charging of a quantum battery consisting of N qubits, coupled to a driven qubit charger in a star configuration.<n>We investigate how an "asymptotic freedom"-like behavior, in which all the energy deposited into the battery can be extracted as work.
• Score: 0.3277163122167433
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum batteries, small-scale energy storage devices based on quantum systems, offer the potential for enhanced charging performance through quantum effects such as coherence and collectivity. In this work, we study the collective charging of a quantum battery consisting of N qubits, coupled to a driven qubit charger in a star configuration, with controlled pure dephasing acting on the charger. We investigate how an "asymptotic freedom"-like behavior, in which all the energy deposited into the battery can be extracted as work, resulting in the ergotropy-to-energy ratio approaching unity, can emerge in the steady state of the battery. We show that the ergotropy-to-energy ratio increases with the number of qubits and approaches unity asymptotically as 1 - O(1/N). In the large-N limit, the emergence of approximate ground-state degeneracy of the collective battery system leads to this asymptotic freedom behavior, despite the battery state remaining mixed. We also discuss the scaling behavior of the charging time of the battery with N.

Related papers

• Quantum Charging Advantage in Superconducting Solid-State Batteries [15.41964054143452]
  We experimentally RefCdemonstrate quantum charging advantage (QCA) in a scalable solid-state quantum battery.<n>We show how double-excitation Hamiltonians for two-level systems promote scalable QCA.<n>We study the performance of quantum charging compared to its uncorrelated classical counterpart.
  arXiv  Detail & Related papers  (2026-02-09T12:55:21Z)
• Collective charging of an organic quantum battery [14.15049744473495]
  We study the collective charging of a quantum battery (QB) consisting of a one-dimensional molecular aggregate and a coupled single-mode cavity.<n>For fixed $N$ and exciton-cavity coupling, there exist optimal exciton-exciton interactions at which the maximum stored energy density and the maximum charging power density reach their respective maxima.
  arXiv  Detail & Related papers  (2025-04-01T06:21:40Z)
• Entanglement and energy transportation in the central-spin quantum battery [13.879580501607691]
  Quantum battery exploits the principle of quantum mechanics to transport and store energy.<n>We study the energy transportation of the central-spin quantum battery, which is composed of $N_b$ spins serving as the battery cells, and surrounded by $N_c$ spins serving as the charger cells.
  arXiv  Detail & Related papers  (2025-02-11T12:32:17Z)
• Harnessing Nth Root Gates for Energy Storage [30.733286944793527]
  We explore the use of fractional control-not gates in quantum thermodynamics. Nth-root gate allows for a paced application of two-qubit operations. We apply it in quantum thermodynamic protocols for charging a quantum battery.
  arXiv  Detail & Related papers  (2024-09-16T14:57:55Z)
• Sunburst quantum Ising battery [0.0]
  We study the energy transfer process in the recently proposed sunburst quantum Ising model. We show that in this model of the quantum battery, coupling between the battery and charger can be used to optimize the ergotropy.
  arXiv  Detail & Related papers  (2024-06-26T11:10:09Z)
• Stable collective charging of ultracold atoms quantum batteries [0.0]
  We propose a novel quantum battery realized with a few interacting particles in a three-well system with different on-site energies. We charge the battery using a Spatial Adiabatic Passage (SAP)-based protocol, enabling the population of a higher energy well.
  arXiv  Detail & Related papers  (2024-06-11T16:05:11Z)
• Local-projective-measurement-enhanced quantum battery capacity [13.61700291107261]
  capacity is an important indicator for a battery. We study the enhancement of the battery capacity under local projective measurements on a subsystem of the quantum state.
  arXiv  Detail & Related papers  (2024-05-06T01:11:25Z)
• Steady-state charging of quantum batteries via dissipative ancillas [0.0]
  We investigate the steady-state charging process of a single-cell quantum battery embedded in an N-cell star network of qubits. We find an optimal steady-state charging in both scenarios, which grows monotonically with the reservoirs' chemical potential and chemical potential difference.
  arXiv  Detail & Related papers  (2023-10-26T05:56:15Z)
• Beneficial and detrimental entanglement for quantum battery charging [0.0]
  We assess the potential advantage of using highly entangled quantum states between the initial and final states of the charging protocol. We show that the quantum state advantage of battery charging, defined as the power obtainable for given quantum speed limit and battery energy gap, is not an entanglement monotone.
  arXiv  Detail & Related papers  (2023-03-14T12:27:46Z)
• Optimal charging of a superconducting quantum battery [13.084212951440033]
  We report the experimental realization of a quantum battery based on superconducting qubits. Our model explores dark and bright states to achieve stable and powerful charging processes, respectively. Our results pave the way for proposals of new superconducting circuits able to store extractable work for further usage.
  arXiv  Detail & Related papers  (2021-08-09T18:53:07Z)
• Quantum speed-up in collisional battery charging [0.0]
  We present a collision model for the charging of a quantum battery by identical nonequilibrium qubit units. We show that coherent protocols can yield higher charging power than any possible incoherent strategy.
  arXiv  Detail & Related papers  (2021-05-05T04:28:43Z)
• Bounds on charging power of open quantum batteries [0.0]
  We study fundamental bounds on the power of open quantum batteries from the geometric point of view. Our results show that the maximum value of both the stored work and the corresponding power is achieved in the non-Markovian underdamped regime.
  arXiv  Detail & Related papers  (2020-03-22T05:33:08Z)

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.