Phase-sensitive amplification via coherent population oscillations in metastable helium at room temperature

TL;DR

This paper demonstrates phase-sensitive amplification in metastable helium at room temperature using coherent population oscillations, achieving high gain and near-ideal phase transfer, suitable for quantum applications.

Contribution

The study introduces a novel room-temperature PSA technique using metastable helium and coherent population oscillations, achieving high gain and purity.

Findings

PSA gain of nearly 7 achieved

Bandwidth of 200 kHz demonstrated

Near-ideal phase transfer confirmed

Abstract

We report our experimental results on phase-sensitive amplification (PSA) in non-degenerate signal-idler configuration using ultra-narrow coherent population oscillations in metastable helium at room temperature. We achieved a high PSA gain of nearly 7 with a bandwidth of 200 kHz, by using the system at resonance in a single-pass scheme. Further, the measured minimum gain is close to the ideal value, showing that we have a pure PSA. This is also confirmed from our phase-to-phase transfer curves measurements, illustrating that we have a nearly perfect squeezer, which is interesting for a variety of applications.