Ultrafast Optimal Sideband Cooling under Non-Markovian Evolution

TL;DR

This paper presents a novel ultrafast sideband cooling method leveraging non-Markovian dynamics and optimal control, achieving faster ground state cooling at lower phonon numbers in cavity optomechanics.

Contribution

It introduces a structured environment-based cooling strategy with optimal timing, outperforming previous methods and compatible with current experimental capabilities.

Findings

Faster cooling rates with lower phonon occupation.

Achieves ground state cooling with experimentally accessible coupling strengths.

Optimal control maintains minimal phonon number after cooling.

Abstract

A sideband cooling strategy that incorporates (i) the dynamics induced by structured (non-Markovian) environments in the target and auxiliary systems and (ii) the optimally-time-modulated interaction between them is developed. For the context of cavity optomechanics, when non-Markovian dynamics are considered in the target system, ground state cooling is reached at much faster rates and at much lower phonon occupation number than previously reported. In constrast to similar current strategies, ground state cooling is reached here for coupling-strength rates that are experimentally accesible for the state-of-the-art implementations. After the ultrafast optimal-ground-state-cooling protocol is accomplished, an additional optimal control strategy is considered to maintain the phonon number as closer as possible to the one obtained in the cooling procedure. Contrary to the conventional expectation, when non-Markovian dynamics are considered in the auxiliary system, the efficiency of the cooling protocol is undermined.