All-atomic source of squeezed vacuum with full pulse-shape control

TL;DR

This paper demonstrates the generation of low-frequency squeezed vacuum pulses with controllable pulse shapes using hot Rb vapor, achieving noise suppression over 2 dB below the quantum limit without loss of squeezing.

Contribution

It introduces a method to precisely control the temporal profile of squeezed vacuum pulses via magnetic field tuning in atomic vapor.

Findings

Achieved >2 dB noise suppression below quantum limit

Controlled pulse shaping of squeezed vacuum without degrading squeezing

Utilized polarization self-rotation in hot Rb vapor

Abstract

We report on the generation of pulses of a low-frequency squeezed vacuum with noise suppression >2 dB below the standard quantum limit in a hot resonant 87 Rb vapor with polarization self-rotation. We demonstrate the possibility to precisely control the temporal profile of the squeezed noise quadrature by applying a calibrated longitudinal magnetic field, without degrading the maximum amount of squeezing.