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The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting

Strong Relative-Intensity Squeezing of Light from Four-Wave Mixing in Hot Rb Vapor

Paul D. Lett, Vincent Boyer, Alberto M. Marino, Colin F. McCormick, E. Arimondo

Published Jan 1, 2007• 1 citation
Publisher

Abstract

We use nondegenerate four-wave mixing in hot atomic vapor to generate up to −7.1dB of relative-intensity squeezing between the probe and conjugate beams. This narrowband, multispatial-mode, squeezed light near an atomic resonance is of interest for image processing as well as experiments involving atomic ensembles.
DOI
10.1364/cqo.2007.ctuc3

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We have measured -3.5 dB (-8.1 dB corrected for losses) relative intensity squeezing between probe and conjugate beams generated by stimulated, nondegenerate four-wave mixing in hot rubidium vapor. Unlike early observations of squeezing in atomic vapors based on saturation of a two-level system, our scheme uses a resonant nonlinearity based on ground-state coherences in a three-level system. Since this scheme produces narrowband, squeezed light near an atomic resonance, it is of interest for experiments involving cold atoms or atomic ensembles.
The goal of the project is to produce a pair of polarization-entangled light fields using four-wave mixing in hot Rb vapor. In this process, interaction of atoms with near-resonant strong control optical field results in strong amplification of a nearly-collinear probe optical field and in generation of a quantum correlated conjugate Stokes optical field. In order to establish the quantum correlation between the Stokes and probe fields, we have adopted a homodyne detection scheme. If the differential noise between the Stokes and probe fields is below the quantum noise limit, then intensity fluctuation entanglement has been achieved, and it is possible to produce the polarization Bell states.