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Waveguide Mach-Zehnder interferometer to enhance the sensitivity of quantum parameter estimation.

X N Feng, H Y Liu, L F Wei

    Optics Express
    |June 29, 2023
    PubMed
    Summary

    We propose a novel waveguide Mach-Zehnder interferometer (MZI) for enhanced quantum parameter estimation. This new design offers improved sensitivity compared to the waveguide Fabry-Perot interferometer (FPI).

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    Area of Science:

    • Quantum optics
    • Quantum metrology
    • Integrated photonics

    Background:

    • Waveguide Fabry-Perot interferometers (FPI) are used for sensitive quantum parameter estimation.
    • Enhancing sensitivity in quantum estimation is crucial for advancing metrology.

    Purpose of the Study:

    • To propose a waveguide Mach-Zehnder interferometer (MZI) for improved quantum parameter estimation sensitivity.
    • To theoretically demonstrate the enhanced sensitivity of the proposed waveguide MZI compared to existing waveguide FPI.

    Main Methods:

    • Utilizing two coupled one-dimensional waveguides and atomic mirrors as beam splitters.
    • Controlling photon transfer probabilities between waveguides via atomic mirrors.
    • Exploiting quantum interference of waveguide photons for phase estimation.

    Main Results:

    • The proposed waveguide MZI configuration enhances quantum parameter estimation sensitivity.
    • Sensitivity is optimized compared to waveguide FPI under identical conditions.
    • Feasibility is discussed in the context of current atom-waveguide integrated techniques.

    Conclusions:

    • The waveguide MZI offers a promising platform for highly sensitive quantum parameter estimation.
    • This approach represents a significant advancement over waveguide FPI for quantum metrology.
    • The proposed method is compatible with existing integrated quantum technologies.