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

Tian Li, Brian E Anderson, Travis Horrom

    Optics Express
    |October 19, 2017
    PubMed
    Summary

    A phase-sensitive amplifier (PSA) enhances quantum correlation measurements by pre-amplifying specific modes of squeezed light. This method improves the detection of quantum correlations, even with optical and detection losses.

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    Area of Science:

    • Quantum Optics
    • Atomic Physics

    Background:

    • Two-mode squeezed states are crucial for quantum information processing.
    • Optical and detection losses degrade quantum correlations, limiting measurement precision.

    Purpose of the Study:

    • To investigate the use of a phase-sensitive amplifier (PSA) for enhancing quantum correlation measurements.
    • To improve the measurement of two-mode quantum correlations before loss degradation.

    Main Methods:

    • Generating bright beams in a two-mode squeezed state using four-wave mixing (4WM) in 85Rb vapor.
    • Employing a second 4WM interaction in a PSA configuration to pre-amplify a selected quadrature of one mode.
    • Intentionally introducing optical and detection losses to assess the PSA's performance.

    Main Results:

    • Demonstrated the ability of a PSA to noiselessly pre-amplify a selected quadrature.
    • Showcased an enhancement in the measured degree of intensity correlation between the two modes.
    • Observed improved intensity-difference squeezing between the two modes.

    Conclusions:

    • A PSA can effectively pre-amplify quantum states to counteract loss-induced degradation.
    • This technique offers a promising method for improving the measurement of quantum correlations in various quantum optical systems.