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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Light-matter quantum interferometry with homodyne detection.

László Ruppert, Radim Filip

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    |August 10, 2017
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    Summary
    This summary is machine-generated.

    We developed an interferometric method to estimate unknown properties of matter systems by measuring interacting light. This quantum metrology approach offers superior precision even with noisy systems and weak light-matter coupling.

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    Area of Science:

    • Quantum optics
    • Quantum metrology
    • Light-matter interaction

    Background:

    • Estimating the properties of quantum matter systems is crucial for advancements in quantum technologies.
    • Direct measurement of matter system states is often challenging or impossible.
    • Indirect measurement via interacting systems, like optical modes, presents an alternative.

    Purpose of the Study:

    • To investigate the estimation of unknown Gaussian processes (displacement, squeezing, phase-shift) in a matter system.
    • To propose and evaluate an interferometric setup for indirect quantum state estimation.
    • To compare the proposed method against non-interferometric schemes.

    Main Methods:

    • An interferometric setup utilizing a beam-splitter-type light-matter interaction was designed.
    • Homodyne detectors were employed to measure the interacting optical mode.
    • Two distinct estimation methods were applied within the interferometric framework.

    Main Results:

    • The proposed interferometric setup demonstrated superior estimation performance compared to non-interferometric methods.
    • Effective estimation was achieved even with limited light-matter coupling strength.
    • Robust estimation was possible despite significant noise in the matter system.

    Conclusions:

    • Interferometric measurement of an interacting optical mode provides a powerful tool for quantum metrology of matter systems.
    • The proposed technique is resilient to experimental imperfections like weak coupling and system noise.
    • This work paves the way for novel experimental platforms in light-matter interferometry for precise matter characterization.