Environment assisted speed-up of the field evolution in cavity QED

TL;DR

This paper demonstrates that by controlling the number of atoms coupled to an optical cavity, the quantum speed of the field's state evolution can be accelerated, highlighting environment-assisted speed-up in cavity QED systems.

Contribution

It introduces a method to enhance the quantum speed of field evolution in cavity QED by tuning the atom-cavity coupling, revealing environment-assisted speed-up effects.

Findings

Quantum speed increases with atom-cavity coupling strength.

Environment control enables faster state re-population in the cavity.

Non-Markovian environment enhances the speed-up effect.

Abstract

We measure the quantum speed of the state evolution of the field in a weakly-driven optical cavity QED system. To this end, the mode of the electromagnetic field is considered as a quantum system of interest with a preferential coupling to a tunable environment: the atoms. By controlling the environment, i.e., changing the number of atoms coupled to the optical cavity mode, an environment assisted speed-up is realized: the quantum speed of the state re-population in the optical cavity increases with the coupling strength between the optical cavity mode and this non-Markovian environment (the number of atoms).