Stabilizing quantum coherence against pure dephasing in the presence of quantum feedback at finite temperature

TL;DR

This paper introduces a formalism for quantum emitter dynamics in structured reservoirs, demonstrating that non-Markovian feedback can preserve quantum coherence at room temperature.

Contribution

It develops a general formalism for structured reservoir dynamics and shows coherence preservation via quantum feedback at finite temperatures.

Findings

Unconventional dephasing dynamics due to non-Markovian feedback.

Finite coherence preservation up to room temperature.

Application to atom-like emitters in phonon cavities.

Abstract

A general formalism to describe the dynamics of quantum emitters in structured reservoirs is introduced. As an application, we investigate the optical coherence of an atom-like emitter diagonally coupled via a link-boson to a structured bosonic reservoir and obtain unconventional dephasing dynamics due to non-Markovian quantum feedback for different temperatures. For a two-level emitter embedded in a phonon cavity preservation of finite coherence is predicted up to room temperature.