Experimental verification of quantum battery capacity with an optical platform

TL;DR

This paper experimentally verifies the concept of quantum battery capacity using optical two-photon states, demonstrating its unique features and relationships with quantum correlations, coherence, and entropy.

Contribution

It provides the first experimental validation of quantum battery capacity and explores its connection with quantum properties using an optical platform.

Findings

Quantum battery capacity is experimentally confirmed.

Quantum correlations influence battery capacity.

Trade-offs exist between capacity, entropy, coherence, and entanglement.

Abstract

Quantum batteries, consisting of quantum cells, are anticipated to surpass their classical counterparts in performance because of the presence of quantum correlations. Recent theoretical study introduces the quantum battery capacity that is defined according to the highest and the lowest energy during the charging and discharging procedures. Here, we present an experimental verification of quantum battery capacity and its relationships with other quantum characters of battery by using two-photon states. This reveals a distinguished feature of quantum battery capacity and its trade-off relationship with the entropy of the battery state, as well as with measures of coherence and entanglement.