Electronic noise-free measurements of squeezed light

TL;DR

This paper presents a correlation measurement technique for characterizing squeezed light that effectively eliminates electronic noise, enabling more accurate analysis of quantum states.

Contribution

The authors introduce a novel correlation-based method that distinguishes quantum states and reduces electronic noise impact compared to traditional techniques.

Findings

Correlation measurements can identify squeezed, coherent, and thermal states.

The method eliminates electronic noise contribution in measurements.

It improves accuracy in low-light squeezed light experiments.

Abstract

We study the implementation of a correlation measurement technique for the characterization of squeezed light. We show that the sign of the covariance coefficient revealed from the time resolved correlation data allow us to distinguish between squeezed, coherent and thermal states. In contrast to the traditional method of characterizing squeezed light, involving measurement of the variation of the difference photocurrent, the correlation measurement method allows to eliminate the contribution of the electronic noise, which becomes a crucial issue in experiments with dim sources of squeezed light.