Charging efficiency bursts in a quantum battery with cyclic indefinite causal order
Phys. Rev. A 114, 042624 – Published 28 October, 2026
DOI: https://doi.org/10.1103/5b41-q9pv
Abstract
Enhancement of quantum battery performance is a popular subject in quantum thermodynamics. An interesting phenomenon is the quick charging effect [Phys. Rev. Res. 6, 023136 (2024)], which has been explored by utilizing a quantum interferometric technique known as superposition of trajectories. A similar technique used to boost quantum battery performance is indefinite causal order. Here, we propose a charging protocol that utilizes cyclic indefinite causal order, whereby charging sequences are superposed when utilizing chargers. We observe charging efficiency bursts when implementing our cyclic indefinite charging protocol. The duration of these bursts increases with . Additionally, we present a circuit model to implement our charging protocol for the two-charger scenario and perform proof-of-concept demonstrations on IonQ, Quantinuum, and IBMQ quantum processors. The results validate the existence of charging efficiency bursts as shown by our theoretical analysis and numerical simulations.