Qutrit quantum battery: comparing different charging protocols

TL;DR

This paper compares two protocols for charging three-level quantum batteries using classical pulses, demonstrating that simultaneous pulsing achieves faster charging times and higher power, validated through analytical solutions and IBM quantum device tests.

Contribution

It introduces and analytically compares sequential and simultaneous charging protocols for qutrit quantum batteries, highlighting the efficiency of the simultaneous approach.

Findings

Simultaneous pulses reduce charging time compared to sequential pulses.

The fastest stable charging time achieved in solid-state quantum batteries.

Protocols validated on IBM superconducting quantum devices.

Abstract

Motivated by recent experimental observations carried out in superconducting transmon circuits, we compare two different charging protocols for three-level quantum batteries based on time dependent classical pulses. In the first case the complete charging is achieved through the application of two sequential pulses, while in the second the charging occurs in a unique step applying the two pulses simultaneously. Both protocols are analytically solvable leading to a complete control on the dynamics of the quantum system. According to this it is possible to determine that the latter approach is characterized by a shorter charging time, and consequently by a greater charging power. We have then tested these protocols on IBM quantum devices based on superconducting circuits in the transmon regime. The minimum achieved charging time represents the fastest stable charging reported so far in solid state quantum batteries.