arXiv subjects

Ni-Ya Zhuang

Publications and source records attributed to Ni-Ya Zhuang.

4 recordsLinked to original sources

arXiv2026

Coherent catalyst induced stabilization of ergotropy in open quantum batteries

Environmental dissipation and thermal fluctuations fundamentally constrain the extractable work and long-time stability of open quantum batteries. To mitigate dissipation-induced energy degradation without external driving protocols, we propose a cavity-mediated hybrid quantum battery coupled to an auxiliary coherent qubit. Using the Lindblad master equation and ergotropy analysis, we show that coherent interference between different interaction channels generates a decoherence-free-like invariant subspace that suppresses relaxation-induced energy leakage and stabilizes the steady-state ergotropy. The resulting protection mechanism remains effective under strong dissipation and finite-temperature conditions, indicating that interference-assisted coherent control may provide a feasible strategy for robust quantum energy storage in nonequilibrium open systems.

quant-ph↗

arXiv2026

Energy-Invariant Catalysis of Stable Ergotropy in Strongly Coupled Spin-Chain Quantum Batteries

Quantum batteries (QBs) provide a platform for exploring quantum-scale energy storage, yet most existing analyses rely on weak-coupling and Markovian approximations. In realistic implementations operating in strongly coupled non-Markovian regimes, environmental memory effects induce pronounced oscillations of the maximum extractable work (ergotropy), hindering stable energy output. Here, we investigate the stabilization of ergotropy in a spin-chain QB assisted by an energy-invariant catalyst, namely an auxiliary subsystem whose average energy remains unchanged during the evolution. The dynamics are described by a Nakajima-Zwanzig master equation with a Gaussian memory kernel, enabling a systematic characterization of non-Markovian effects. Our results show that the memory-kernel parameters, the spin number, and the characteristic frequencies of both the cavity field and the local excitations jointly regulate the ergotropy dynamics. Compared with the uncatalyzed case, the catalyst effectively reshapes the system energy spectrum, markedly suppresses non-Markovian oscillations, and promotes a quasi-stationary regime of extractable work. These findings provide a practical strategy for stabilizing energy flows in strongly coupled open quantum systems, offering theoretical guidance for the development of robust quantum energy devices and contributing to ongoing research in quantum thermodynamics.

quant-ph↗

arXiv2025

Rapid and Stable Collective Charging and Discharge Suppression in Strongly Coupled Many-Body Quantum Batteries

Achieving rapid and stable energy storage in quantum batteries (QBs) remains a key challenge, particularly under strong system-environment coupling where non-Markovian effects become prominent. While most previous studies focus on weak coupling regimes, we propose a many-body QB model exhibiting collective charging and discharge suppression in a non-perturbative regime. The model adopts a $Λ$-type configuration where multiple battery units share a common excited state and have individual ground states, forming an effective collective structure. To accurately capture the dynamics under strong coupling, the system's time evolution is governed by a Redfield-type master equation tincorporating memory effects via a Debye spectral density. We quantify the stored energy using ergotropy and analyze the impact of tunneling, driving strength, spectral width, and environmental temperature on charging performance. Numerical simulations reveal that optimized driving and reservoir engineering can simultaneously achieve rapid and stable charging while suppressing energy leakage. These results provide theoretical insight into strong-coupling thermodynamics and guide the design of robust QB platforms using solid-state or atomic systems.

quant-ph↗

arXiv2025

Non-Markovian N-spin chain quantum battery in thermal charging process

Ergotropy serves as a key indicator for assessing the performance of quantum batteries(QBs). Using the Redfield master equation, we investigate ergotropy dynamics in a non-Markovian QB composed of an N-spin chain embedded in a microcavity. Distinct from Markovian charging process, the thermal charging process exhibits a distinct oscillatory behavior in the extracted ergotropy. We show these oscillations are suppressible via synergistic control of coherent driving, cavity parameters, and spin-spin couplings. In addition, we analyze the influence of various system and environmental parameters on the time evolution of ergotropy, revealing rich dynamical features. Our results offer new insights into the control of energy extraction in QBs and may inform future designs of practical battery architectures.

quant-ph↗