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Distillation of squeezing using an engineered pulsed parametric down-conversion source.

Thomas Dirmeier, Johannes Tiedau, Imran Khan

    Optics Express
    |October 29, 2020
    PubMed
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    Researchers enhanced pulsed squeezed states using photon subtraction, improving squeezing by 0.17 dB. This method is suitable for scalable hybrid quantum networks with pulsed quantum light.

    Area of Science:

    • Quantum Information Science
    • Quantum Optics
    • Nonlinear Optics

    Background:

    • Hybrid quantum information processing merges discrete and continuous variable protocols.
    • Optical filters are often required for combining photon counting and homodyne measurements, limiting efficiency.
    • Pulsed sources and detection schemes pose challenges for hybrid protocols.

    Purpose of the Study:

    • To implement a distillation protocol for pulsed squeezed states using photon subtraction.
    • To overcome limitations imposed by optical filters in hybrid quantum experiments.
    • To demonstrate a scalable approach for hybrid quantum networks using pulsed quantum light.

    Main Methods:

    • Utilized photon subtraction for distilling pulsed squeezed states.
    • Employed a single-mode parametric down-conversion source in nonlinear waveguides.

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  • Analyzed state purity and non-Gaussianity using higher-order cumulants.

    • Main Results:

    • Achieved an improvement of 0.17 dB in squeezing from an initial value of -1.648 ± 0.002 dB.
    • Obtained a purity of 0.58 for the distilled quantum state.
    • Confirmed the non-Gaussian nature of the distilled state.

    Conclusions:

    • Photon subtraction effectively distills pulsed squeezed states, enhancing squeezing and purity.
    • The developed method overcomes limitations of traditional optical filtering in hybrid protocols.
    • The demonstrated source and distillation technique are suitable for scalable hybrid quantum network applications.