Correlation Measurement of Squeezed Light

TL;DR

This paper presents a correlation measurement technique for characterizing squeezed light that minimizes electronic noise impact, effectively detecting squeezing and estimating its degree compared to traditional homodyne methods.

Contribution

It introduces a nearly noise-free correlation method for measuring squeezing, providing an alternative to homodyne detection with reduced electronic noise influence.

Findings

Correlation method accurately detects squeezing sign

Estimates degree of squeezing comparable to homodyne

Reduces impact of electronic detector noise

Abstract

We study the implementation of a correlation measurement technique for the characterization of squeezed light which is nearly free of electronic noise. With two different sources of squeezed light, we show that the sign of the covariance coefficient, revealed from the time resolved correlation data, is witnessing the presence of squeezing in the system. Furthermore, we estimate the degree of squeezing using the correlation method and compare it to the standard homodyne measurement scheme. We show that the role of electronic detector noise is minimized using the correlation approach as opposed to homodyning where it often becomes a crucial issue.