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    Area of Science:

    • Quantum optics and interferometry
    • Linear optical scatterers
    • Optical sensing technologies

    Background:

    • Traditional beam-splitters limit interferometric systems.
    • Previous Grover coin implementations required unstable ring cavities.
    • Phase parameter redundancy exists in standard Michelson interferometers.

    Purpose of the Study:

    • To present a low-resource, robust optical implementation of a four-dimensional Grover coin.
    • To integrate the Grover coin into a Grover-Michelson interferometer for enhanced performance.
    • To demonstrate improved phase sensitivity and tuning capabilities in interferometric measurements.

    Main Methods:

    • Developed a four-port linear-optical scatterer (Grover coin) without internal interference.
    • Replaced the beam-splitter in a Michelson interferometer with the novel Grover coin.
    • Characterized the resulting Grover-Michelson interferometer's performance, including visibility and phase sensitivity.

    Main Results:

    • Achieved an intensity interferogram with 97% visibility.
    • Demonstrated phase sensitivity over an order of magnitude greater than a standard Michelson interferometer.
    • Enabled continuous tuning of interference pattern shape and slope by removing phase parameter redundancy.

    Conclusions:

    • The novel Grover coin offers a stable, low-resource alternative to previous designs.
    • The Grover-Michelson interferometer significantly outperforms traditional Michelson systems in phase delay evaluation.
    • This technology holds great potential for advancing interferometric sensing and control systems.