• Accepted Paper

Charging efficiency bursts in a quantum battery with cyclic indefinite causal order

Po-Rong Lai, Hsien-Chao Jan, Jhen-Dong Lin, and Yueh-Nan Chen

Phys. Rev. A - Accepted 5 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 new charging protocol that utilizes cyclic indefinite causal order, whereby N charging sequences are superposed when utilizing N chargers. We observe charging efficiency bursts when implementing our cyclic indefinite charging protocol. The duration of these bursts increases with N. 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.

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