Enhancing self-discharging process with disordered quantum batteries

TL;DR

This paper investigates how disorder in Hamiltonian systems can mitigate self-discharging in quantum batteries, revealing that disorder can enhance ergotropy and extend battery lifetime by counteracting decoherence effects.

Contribution

It demonstrates that disorder can compensate for decoherence in quantum batteries, leading to improved performance and longer half-life, a novel approach in quantum battery research.

Findings

Disorder can improve quantum battery performance by counteracting decoherence.

Proper tuning of disorder enhances ergotropy beyond initial stored energy.

Disorder increases the half-life time of quantum batteries.

Abstract

One of the most important devices emerging from quantum technology are quantum batteries. However, self-discharging, the process of charge wasting of quantum batteries due to decoherence phenomenon, limits their performance, measured by the concept of ergotropy and half-life time of the quantum battery. The effects of local field fluctuation, introduced by disorder term in Hamiltonian of the system, on the performance of the quantum batteries is investigated in this paper. The results reveal that the disorder term could compensate disruptive effects of the decoherence, i.e. self-discharging, and hence improve the performance of the quantum battery via "incoherent gain of ergotropy" procedure. Adjusting the strength of disorder parameter to a proper value and choosing a suitable initial state of quantum battery, the amount of free ergotropy, defined with respect to free Hamiltonian, could exceed the amount of initial stored ergotropy. In addition harnessing the degree of disorder parameter could help to enhance the half-life time of the quantum battery. This study opens perspective to further investigation of the performance of quantum batteries that explore disorder and many-body effects.