Nonreciprocal Quantum Batteries

Nonreciprocity, arising from the breaking of time-reversal symmetry, hasbecome a fundamental tool in diverse quantum technology applications. Itenables directional flow of signals and efficient noise suppression,constituting a key element in the architecture of current quantum informationand computing systems. Here we explore its potential in optimizing the chargingdynamics of a quantum battery. By introducing nonreciprocity through reservoirengineering during the charging process, we induce a directed energy flow fromthe quantum charger to the battery, resulting in a substantial increase inenergy accumulation. Despite local dissipation, the nonreciprocal approachdemonstrates a fourfold increase in battery energy compared to conventionalcharger-battery systems. We demonstrate that employing a shared reservoir canestablish an optimal condition where nonreciprocity enhances chargingefficiency and elevates energy storage in the battery. This effect is observedin the stationary limit and remains applicable even in overdamped couplingregimes, eliminating the need for precise temporal control over evolutionparameters. Our result can be extended to a chiral network of quantum nodes,serving as a multi-cell quantum battery system to enhance storage capacity. Theproposed approach is straightforward to implement using currentstate-of-the-art quantum circuits, both in photonics and superconductingquantum systems. In a broader context, the concept of nonreciprocal charginghas significant implications for sensing, energy capture, and storagetechnologies or studying quantum thermodynamics.

Further reading#

• Access Paper in arXiv.org