Cavity-mediated collective laser-cooling of a non-interacting atomic gas inside an asymmetric trap to very low temperatures

TL;DR

This paper introduces a novel cavity-mediated laser cooling method for non-interacting atomic gases, leveraging a collective phonon expectation value to achieve extremely low temperatures through an alternating cooling and displacement cycle.

Contribution

It proposes a new collective laser cooling scheme utilizing a many-particle phonon expectation value to enhance cooling efficiency in atomic gases.

Findings

Achieves cooling to near-zero temperature in the many-particle limit.

Uses a cyclic process of laser pulses and trap asymmetry to sustain cooling.

Demonstrates the potential for ultra-cold atomic gases in optical cavities.

Abstract

In this paper, we identify a many-particle phonon expectation value $\zeta$ with the ability to induce collective dynamics in a non-interacting atomic gas inside an optical cavity. We then propose to utilise this expectation value to enhance the laser cooling of many atoms through a cyclic two-stage process which consists of cooling and displacement stages. During cooling stages, short laser pulses are applied. These use $\zeta$ as a resource and decrease the vibrational energy of the atomic gas by a fixed amount. Subsequent displacement stages use the asymmetry of the trapping potential to replenish the many-particle phonon expectation value $\zeta$. Alternating both stages of the cooling process is shown to transfer the atomic gas to a final temperature which vanishes in the infinitely-many particle limit.