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Quantum Information and Measurement (QIM)

Phase-sensitive Amplification in Metastable Helium

Chitram Banerjee, Jasleen Lugani, Pascal Neveu, Fabien Bretenaker, Fabienne Goldfarb

Published Jan 1, 2017• 0 citations
Publisher

Abstract

We demonstrate phase-sensitive amplification based on coherent population oscillations in metastable helium with a maximum gain of more than 6. The measured minimum gain corresponds to its ideal value, proving that we have a perfect squeezer.
DOI
10.1364/qim.2017.qt6a.65

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In this Letter, we report our experimental results on phase-sensitive amplification (PSA) in a nondegenerate signal-idler configuration using ultranarrow 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 nearly 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.
The minimum resolvable signal in optical metrology and sensing applications is usually limited by the so-called standard quantum limit. One way to improve the signal-to-noise ratio is to use squeezed states of light. Squeezed light can be generated using different types of nonlinear interactions either in solid-state nonlinear crystals or in atomic systems. One way to generate squeezed light is to use a phase sensitive amplifier that will amplify one quadrature of the considered mode and deamplify the other one. We have recently shown that metastable helium vapor at room temperature can exhibit strong four-wave mixing effects and behave like a perfect phase sensitive amplifier when it is prepared in coherent population trapping situation. In this talk, we will present the application of this phase sensitive amplification to the generation of squeezed vacuum states of light and detail the performances and limitations of the system
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text J. Lugani, C. Banerjee, M. Maynard, P. Neveu, R. Ghosh, F. Bretenaker, and F. Goldfarb, "Phase Sensitive Amplification in Metastable Helium at Room Temperature," in Conference on Lasers and Electro-Optics, OSA Technical Digest (online) (Optica Publishing Group, 2016), paper JTu5A.7. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article