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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Phase locking of squeezed vacuum generated by a single-pass optical parametric amplifier.

Yoshitaka Taguchi, Kenichi Oguchi, Zicong Xu

    Optics Express
    |March 18, 2022
    PubMed
    Summary

    This study introduces a new phase-locking method for squeezed vacuum states generated by single-pass optical parametric amplifiers (OPAs). This technique enables precise local oscillator (LO) phase locking, crucial for high-precision optical measurements.

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    Area of Science:

    • Quantum optics
    • Precision measurement

    Background:

    • Squeezed vacuum states reduce shot noise in optical measurements.
    • Precise phase locking of the local oscillator (LO) to squeezed light is essential for utilization.
    • Existing coherent control sideband (CCSB) schemes are incompatible with single-pass optical parametric amplifiers (OPAs).

    Purpose of the Study:

    • To propose and demonstrate a novel CCSB scheme adaptable for squeezed vacuum generation using single-pass OPAs.
    • To enable broadband squeezed vacuum states for advanced optical applications.

    Main Methods:

    • A modified CCSB scheme injecting pump and frequency-shifted signal light into an OPA.
    • Utilizing pump depletion for phase-locking the signal light to the pump light via lock-in detection.
    • Employing heterodyne detection of signal and idler light to obtain an error signal for LO phase locking.

    Main Results:

    • Theoretical feasibility demonstrated by deriving the signal-to-noise ratio (SNR) of the modulated pump signal.
    • Experimental validation of the proposed scheme using pulsed squeezing from a single-pass OPA.

    Conclusions:

    • The proposed CCSB scheme effectively achieves precise phase locking of the LO to the squeezed quadrature for single-pass OPAs.
    • This advancement facilitates the use of broadband squeezed vacuum states in high-precision optical measurements.