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Feedforward-enhanced Fock state conversion with linear optics.

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    We developed an adaptive photon subtraction technique to precisely engineer quantum light states. This method enhances the success probability for manipulating photon numbers in quantum technologies.

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    Area of Science:

    • Quantum optics
    • Photonic quantum technologies
    • Quantum information science

    Background:

    • Engineering quantum states of light is essential for quantum technologies.
    • Photon number manipulation, like subtraction and addition, is a key strategy.
    • Existing methods lack adaptability for complex quantum state manipulation.

    Purpose of the Study:

    • To propose and demonstrate an adaptive multi-photon subtraction scheme.
    • To maximize the probability of successful photon subtraction events.
    • To advance the photonic quantum toolbox for diverse quantum states.

    Main Methods:

    • Theoretical illustration using Fock state conversion via photon subtraction.
    • Experimental demonstration of a feedforward-assisted two-photon to single-photon state conversion.
    • Real-time adjustment of beam splitter ratios based on prior measurement outcomes using fast feedforward loops.

    Main Results:

    • The adaptive scheme maximizes subtraction success probability.
    • Successful experimental implementation of a core feedforward-assisted photon subtraction block.
    • Demonstrated conversion of a two-photon state to a single-photon state.

    Conclusions:

    • The proposed adaptive photon subtraction scheme is effective for quantum state engineering.
    • The technique is applicable to various photonic states, including Fock and squeezed light.
    • This work provides an advanced tool for photonic quantum technology development.