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arXiv · 1708.08334

Improved measurement of two-mode quantum correlations using a phase-sensitive amplifier

Tian Li·Brian E. Anderson·Travis Horrom·Bonnie L. Schmittberger·Kevin M. Jones·Paul D. Lett
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Abstract

We demonstrate the ability of a phase-sensitive amplifier (PSA) to pre-amplify a selected quadrature of one mode of a two-mode squeezed state in order to improve the measurement of two-mode quantum correlations that exist before degradation due to optical and detection losses. We use four-wave mixing (4WM) in $^{85}$Rb vapor to generate bright beams in a two-mode squeezed state. One of these two modes then passes through a second 4WM interaction in a PSA configuration to noiselessly pre-amplify the desired quadrature of the mode before loss is intentionally introduced. We demonstrate an enhancement in the measured degree of intensity correlation and intensity-difference squeezing between the two modes.

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Tian Li, Brian E. Anderson, Travis Horrom, Bonnie L. Schmittberger, Kevin M. Jones, Paul D. Lett. 2017-08-28. Improved measurement of two-mode quantum correlations using a phase-sensitive amplifier. https://doi.org/10.1364/oe.25.021301

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