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arXiv · 2504.15712

(Thermo-)dynamics of the spin-boson model in the weak coupling regime: Application as a quantum battery

Mahima Yadav·Devvrat Tiwari·Subhashish Banerjee
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Abstract

We investigate the spin-boson model's dynamical and thermodynamic features in the weak coupling regime using the weak coupling spin-boson (WCSB) and phase covariant (PC) master equations. Both unital (pure dephasing) and non-unital (dissipative) quantum channels are considered. On the dynamical side, we explore key quantum features including non-Markovianity, quantum speed limit, quantum coherence, and the system's steady-state behavior. Notably, the measures of non-Markovianity exhibit different behavior under WCSB and PC dynamics. From the quantum thermodynamic perspective, we conceptualize the spin-boson system as a quantum battery and analyze its performance through metrics such as energy, ergotropy, anti-ergotropy, and battery capacity. We further examine the roles of pure dephasing and dissipative processes in shaping the battery's performance. Our findings demonstrate the spin-boson model's versatility as a platform for efficient energy storage and transfer in quantum thermodynamic devices.

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Mahima Yadav, Devvrat Tiwari, Subhashish Banerjee. 2025-04-22. (Thermo-)dynamics of the spin-boson model in the weak coupling regime: Application as a quantum battery. https://doi.org/10.1002/qute.202500333

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