Theory of cavity-assisted microwave cooling of polar molecules

TL;DR

This paper investigates cavity-assisted microwave cooling of polar molecules, analyzing mechanisms, rates, and temperature limits, while considering environmental effects and experimental imperfections to optimize cooling strategies.

Contribution

It provides a detailed theoretical analysis of cooling mechanisms, rates, and temperature limits for cavity-assisted microwave cooling of polar molecules, including environmental and experimental considerations.

Findings

Identified dominant cooling and heating mechanisms.

Determined minimal achievable temperature and optimal cooling rate.

Analyzed effects of environment temperature and experimental imperfections.

Abstract

We analyze cavity-assisted cooling schemes for polar molecules in the microwave domain, where molecules are excited on a rotational transition and energy is dissipated via strong interactions with a lossy stripline cavity, as recently proposed by A. Andre et al., Nature Physics 2, 636 (2006). We identify the dominant cooling and heating mechanisms in this setup and study cooling rates and final temperatures in various parameter regimes. In particular we analyze the effects of a finite environment temperature on the cooling efficiency, and find minimal temperature and optimized cooling rate in the strong drive regime. Further we discuss the trade-off between efficiency of cavity cooling and robustness with respect to ubiquitous imperfections in a realistic experimental setup, such as anharmonicity of the trapping potential.