Quantum refrigerator driven by nonclassical light

TL;DR

This paper analyzes a quantum refrigerator driven by various light states, revealing how photon statistics influence cooling power and demonstrating control via high-order coherence of the input light.

Contribution

It introduces a method to evaluate heat current for different light states using P function expansion and highlights the impact of photon statistics on cooling power.

Findings

All light states yield the same coefficient of performance.

Super-Poissonian light enhances cooling power, while sub-Poissonian reduces it.

Photon bunching affects excitation and stimulated emission, influencing cooling current.

Abstract

We study a three-level quantum refrigerator which is driven by a generic light state, even a nonclassical one. With the help of P function expansion of the driving light, we obtain the heat current generated by different types of light states. It turns out all different input light states give the same coefficient of performance for this refrigerator, while the cooling power depend not only on the light intensity but also the specific photon statistics of the driving light. Comparing with the coherent light with the same intensity, the driving light with super(sub)-Poissonian photon statistics could raise a smaller (stronger) cooling power. We find that this is because the bunching photons would first excite the system but then successively induce the stimulated emission, which draws the refrigerator back to the starting state of the cooling process and thus decreases the cooling current generation. This mechanism provides a more delicate control method via the high order coherence of the input light.