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arXiv:1004.3950 · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Strong quantum correlations in four wave mixing in85Rb vapor

Quentin C. Glorieux, Luca Guidoni, S. Guibal, J.-P. Likforman, T. Coudreau

Published Apr 30, 2010• 37 citations
arXivHTMLPDF

Abstract

We study quantum intensity correlations produced using four-wave mixing in a room-temperature rubidium vapor cell. An extensive study of the effect of the various parameters allows us to observe very large amounts of non classical correlations.
DOI
10.1117/12.854953

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We study the generation of intensity quantum correlations using four-wave mixing in a rubidium vapor. The absence of cavities in these experiments allows to deal with several spatial modes simultaneously. In the standard amplifying configuration, we measure relative intensity squeezing up to 9.2 dB below the standard quantum limit. We also theoretically identify and experimentally demonstrate an original regime where, despite no overall amplification, quantum correlations are generated. In this regime, a four-wave mixing setup can play the role of a photonic beam splitter with nonclassical properties, that is, a device that splits a coherent state input into two quantum-correlated beams.
Light entanglement holds the potential for quantum telecommunication and quan- tum computing. The goal of the project is to produce a pair of polarization-entangled light fields using Four Wave Mixing (FWM) in hot Rb vapor. In this process interaction of atoms with near-resonant strong control optical field results in strong amplification of a probe optical field and in generation of a quantum correlated conjugate Stokes opti- cal field. The optimum parameters for FWM have been established. Through analysis of the noise, the RF settings allowing for experimental quantum noise to match the shot noise has been confirmed as well. After establishing the shot noise limit, there were many trials to achieve noise lower than the shot noise. To further improve the noise and thus establish the quantum correlation between our fields, we switched from a single laser to a double laser setup. In the future, the quantum correlation between the Stokes field and the probe field will be further improved to allow for the entangled Bell states creation.