Optimization of photon correlations by frequency filtering

TL;DR

This paper introduces the frequency resolved Mandel parameter to optimize photon correlations in quantum systems by adjusting parameters like filtering and pumping, revealing richer correlation landscapes.

Contribution

It presents a novel method to quantify and optimize photon correlations through frequency filtering in nonlinear quantum systems.

Findings

Correlations are enhanced by combining filtering, pumping, and delay parameters.

The frequency resolved Mandel parameter effectively characterizes correlation strength.

Optimization strategies significantly improve photon correlation signals.

Abstract

Photon correlations are a cornerstone of Quantum Optics. Recent works [NJP 15 025019, 033036 (2013), PRA 90 052111 (2014)] have shown that by keeping track of the frequency of the photons, rich landscapes of correlations are revealed. Stronger correlations are usually found where the system emission is weak. Here, we characterize both the strength and signal of such correlations, through the introduction of the 'frequency resolved Mandel parameter'. We study a plethora of nonlinear quantum systems, showing how one can substantially optimize correlations by combining parameters such as pumping, filtering windows and time delay.