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Deterministic single-photon subtraction based on a coupled single quantum dot-cavity system.

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    We demonstrate a solid-state device that deterministically subtracts single photons from optical pulses. This quantum information processing advancement uses a quantum dot-cavity system and shows potential for integrated quantum technologies.

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    Area of Science:

    • Quantum Optics
    • Solid-State Physics
    • Quantum Information Science

    Background:

    • Single-photon sources and manipulation are crucial for quantum technologies.
    • Deterministic quantum operations require robust and scalable solid-state platforms.

    Purpose of the Study:

    • To propose and simulate a scheme for deterministic single-photon subtraction.
    • To investigate the feasibility of using a coupled quantum dot-cavity system for this purpose.

    Main Methods:

    • Numerical simulation of optical pulse injection into a bimodal photonic crystal cavity coupled to a charged quantum dot.
    • Application of a moderate magnetic field in a Voigt configuration.

    Main Results:

    • The system deterministically transfers one photon into a second cavity mode.
    • Successful subtraction demonstrated for both Fock states and coherent states as input pulses.

    Conclusions:

    • A viable solid-state scheme for deterministic single-photon subtraction is presented.
    • The proposed device offers potential for compact, integrated quantum information processing applications.