Wireless energy transfer in a non-Hermitian quantum battery
Phys. Rev. A 112, 042205 – Published 8 October, 2025
DOI: https://doi.org/10.1103/8xsm-5mb6
Abstract
Energy extraction is one of the fundamental challenges in realizing quantum batteries (QBs). Here we propose a wireless transfer scheme with parity-time symmetry to efficiently extract the energy stored in non-Hermitian QBs to consumption hubs. For linear cases, the transfer energy oscillates periodically in the unbroken symmetry region and grows hyperbolically in the broken region. For nonlinear cases, the transfer energy eventually reaches and remains steady-state values arising from the feedback mechanism of the nonlinear saturable gain. The non-Hermitian QBs with gains can persistently absorb energy and store it in batteries while transfering it to consumption hubs, thus exhibiting more considerable robustness in the large detuning regime and significant enhancement in the weak coupling regime than those in partial deep-strong coupling regime. Furthermore, we also introduce a classical simulator and demonstrate some counterintuitive advantages of the non-Hermitian QBs. Our work overcomes energy bottlenecks of wireless transfer schemes in QBs and may provide inspirations for practical applications of QBs.
