Polarization squeezing of light by single passage through an atomic vapor

TL;DR

This paper demonstrates polarization squeezing of light at the -3dB level using a simple setup with a rubidium vapor cell, enabling quantum information protocols with minimal experimental complexity.

Contribution

It reports the first observation of polarization squeezing at the threshold level in a straightforward, standard polarization setup with rubidium vapor, suitable for quantum information.

Findings

Achieved polarization squeezing at -3dB threshold level.

Simple setup using standard polarization components.

Potential for quantum information applications.

Abstract

We have studied relative-intensity fluctuations for a variable set of orthogonal elliptic polarization components of a linearly polarized laser beam traversing a resonant $^{87}$Rb vapor cell. Significant polarization squeezing at the threshold level (-3dB) required for the implementation of several continuous variables quantum protocols was observed. The extreme simplicity of the setup, based on standard polarization components, makes it particularly convenient for quantum information applications.