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Optimal single-mode squeezing for beam displacement sensing.

Wenhua He, Christos N Gagatsos, Dalziel J Wilson

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    Summary
    This summary is machine-generated.

    This study introduces a new framework for precisely estimating optical beam displacement, even with diffraction loss. It reveals how quantum probes can significantly outperform classical lasers for enhanced optical sensing.

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    Area of Science:

    • Quantum optics
    • Optical sensing
    • Metrology

    Background:

    • Optical beam displacement estimation is crucial for imaging and sensing.
    • Quantum enhancements offer improved measurement precision.
    • Previous methods lacked generality in accounting for diffraction loss and optimizing quantum probes.

    Purpose of the Study:

    • To develop a general framework for quantum-enhanced optical displacement sensing.
    • To investigate the impact of diffraction loss and optimize probe parameters.
    • To identify quantum-optimal probes for linear probe-target interactions with photon loss.

    Main Methods:

    • Reduced an infinite-spatial-mode problem to a three-mode interaction framework for small displacements.
    • Quantified quantum advantage using a single-spatial-mode Gaussian-state probe.
    • Analyzed receiver optimality with a two-spatial-mode homodyne receiver.

    Main Results:

    • Demonstrated a simplified framework for complex quantum sensing problems.
    • Quantified the improvement of quantum probes over classical laser probes.
    • Identified conditions for asymptotically optimal receivers in high-energy limits.

    Conclusions:

    • The study presents a novel strategy for designing quantum-optimal probes in realistic optical sensing scenarios.
    • Findings are applicable to generic multimode linear interactions and photon loss.
    • Offers a pathway to enhanced precision in optical metrology and imaging.