Quantum correlations and non-classicality in a system of two coupled vertical external cavity surface emitting lasers

TL;DR

This paper demonstrates quantum correlations and noise reduction below the standard quantum limit in a coupled two-VECSEL system, revealing how correlated losses induce non-classical light even with Poissonian pump.

Contribution

It introduces a novel analysis of quantum correlations in coupled VECSELs, highlighting the role of correlated losses in generating non-classical states.

Findings

Photocurrent noise can be reduced below the standard quantum limit.

Modal anticorrelation arises due to correlated loss mechanisms.

Non-classicality persists even with Poissonian coherent pumping.

Abstract

Here we demonstrate that photocurrent noise reduction below the standard quantum limit and modal anticorrelation can arise in two mode coupled two-VECSEL system with common pump. This effect occurs due to correlated loss of laser modes. It is possible to suppress noise below the standard quantum limit even for Poissonian coherent pumping, whereas the regularity of the pump can be harmful for non-classicality.