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Optimized phase sensing in a truncated SU(1,1) interferometer.

Prasoon Gupta, Bonnie L Schmittberger, Brian E Anderson

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    Summary
    This summary is machine-generated.

    This study optimizes homodyne detection for truncated SU(1,1) interferometers, enhancing phase estimation sensitivity even with losses. The optimized scheme improves noise reduction and surpasses the standard quantum limit.

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    Area of Science:

    • Quantum optics
    • Interferometry
    • Nonlinear optics

    Background:

    • Homodyne detection is crucial for nonlinear optical gain media interferometers.
    • Previous work optimized homodyne detection for seeded, truncated SU(1,1) interferometers, theoretically achieving the quantum Cramer-Rao bound for phase estimation.
    • Losses in such interferometers can degrade performance.

    Purpose of the Study:

    • To extend previous findings by incorporating losses into the truncated SU(1,1) interferometer model.
    • To determine an optimized homodyne detection scheme for phase measurement in the presence of loss.
    • To experimentally validate the performance of the optimized scheme.

    Main Methods:

    • Theoretical analysis of a truncated SU(1,1) interferometer considering optical loss.
    • Development and implementation of an optimized homodyne detection scheme.
    • Experimental setup of a truncated SU(1,1) interferometer using a two-mode squeezed state.
    • Comparison of noise levels and phase sensitivity with a typical homodyne detection scheme.

    Main Results:

    • The optimized homodyne detection scheme was determined for a lossy truncated SU(1,1) interferometer.
    • Experimental demonstration showed a significant reduction in noise level compared to typical homodyne detection.
    • The optimized scheme achieved enhanced potential phase sensitivity.
    • The device demonstrated an improved ability to exceed the standard quantum limit.

    Conclusions:

    • The optimized homodyne detection scheme effectively mitigates the impact of loss in truncated SU(1,1) interferometers.
    • This approach significantly enhances phase sensitivity and surpasses the standard quantum limit.
    • The findings pave the way for more precise quantum measurements using practical interferometer setups.