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All-optical phase-sensitive detection for ultra-fast quantum computation.

Naoto Takanashi, Asuka Inoue, Takahiro Kashiwazaki

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    |November 13, 2020
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    Summary
    This summary is machine-generated.

    Researchers achieved terahertz-bandwidth phase-sensitive detection for quantum information processing using an all-optical method. This breakthrough overcomes previous limitations, paving the way for faster all-optical quantum computation.

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    Area of Science:

    • Quantum Information Science
    • Quantum Optics
    • Nonlinear Optics

    Background:

    • Phase-sensitive detection is crucial for measurement-based quantum information processing.
    • Conventional electrical detectors are limited to gigahertz bandwidths, hindering quantum computation speed.
    • All-optical detection using optical parametric amplifiers (OPAs) offers a theoretical path to terahertz bandwidths.

    Purpose of the Study:

    • To experimentally demonstrate terahertz-order detection bandwidth for phase-sensitive measurements.
    • To overcome experimental challenges in achieving high parametric gain for continuous-wave OPAs.
    • To enable faster all-optical quantum computation.

    Main Methods:

    • Utilized a fiber-coupled nonlinear χ(2) optical parametric amplifier (OPA) based on a periodically poled lithium niobate waveguide.
    • Employed a durable periodically poled LiNbO3 waveguide suitable for intense continuous-wave pump light.
    • Measured quadrature amplitudes of broadband continuous-wave squeezed light.

    Main Results:

    • Achieved 3 dB of squeezing up to 3 THz of sideband frequency.
    • Demonstrated phase-locking and dispersion compensation for broadband continuous-wave squeezed light.
    • Maintained the phase of squeezed light over a 1 THz bandwidth.

    Conclusions:

    • Developed an ultra-broadband continuous-wave detection method for phase-sensitive measurements.
    • Dispersion compensation technique enhances the stability of squeezed light.
    • The demonstrated technology is a significant step towards realizing all-optical quantum computation with over-terahertz clock frequencies.