All-atomic generation and noise-quadrature filtering of squeezed vacuum in hot Rb vapor

TL;DR

This paper demonstrates all-atomic generation and noise-quadrature filtering of squeezed vacuum states in hot Rb vapor, showing control over noise amplitudes and squeezing angles via EIT, with implications for quantum memory and gravitational wave detection.

Contribution

It introduces a novel all-atomic approach to generate and manipulate squeezed vacuum states using hot Rb vapor and EIT, advancing quantum control techniques.

Findings

Controlled noise amplitude attenuation of squeezed vacuum

Rotation of squeezing angle via EIT-induced dispersion

Potential applications in quantum memory and gravitational wave detection

Abstract

With our all-atomic squeezing and filtering setup, we demonstrate control over the noise amplitudes and manipulation of the frequency-dependent squeezing angle of a squeezed vacuum quantum state by passing it through an atomic medium with electromagnetically induced transparency (EIT). We generate low sideband frequency squeezed vacuum using the polarization self-rotation effect in a hot Rb vapor cell, and input it into a second atomic vapor subject to EIT conditions. We use the frequency-dependent absorption of the EIT window to demonstrate an example of squeeze amplitude attenuation and squeeze angle rotation of the quantum noise quadratures of the squeezed probe. These studies have implications for quantum memory and storage as well as gravitational wave interferometric detectors.