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Related Experiment Video

Updated: Jul 31, 2025

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Sub-0.1 degree phase locking of a single-photon interferometer.

Vojtěch Švarc, Martina Nováková, Michal Dudka

    Optics Express
    |May 9, 2023
    PubMed
    Summary

    We developed a phase-locking technique for single-photon interferometers, achieving 0.05-degree precision over 15 hours. This method enhances quantum communication and metrology by stabilizing quantum signals with high accuracy.

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    Area of Science:

    • Quantum Optics
    • Quantum Information Science

    Background:

    • Mach-Zehnder interferometers are crucial for quantum applications.
    • Maintaining phase stability is a significant challenge in quantum interferometry.

    Purpose of the Study:

    • To develop a robust phase-locking method for single-photon Mach-Zehnder interferometers.
    • To achieve high phase precision over extended periods.

    Main Methods:

    • Utilized an auxiliary reference light at a distinct wavelength.
    • Implemented continuous phase locking with negligible crosstalk.
    • Ensured performance is independent of reference light intensity fluctuations.

    Main Results:

    • Achieved a phase precision of 0.05 degrees over 15 hours.
    • Demonstrated continuous operation for arbitrary quantum signal phases.
    • Showcased robustness against reference intensity variations.

    Conclusions:

    • The developed phase-locking technique significantly improves phase stability in quantum interferometers.
    • This method has broad applicability in quantum communication and quantum metrology.
    • Enhances the reliability and precision of phase-sensitive quantum applications.