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    We investigated photon transport in a chiral waveguide coupled to a nonlinear resonator. The system acts as a reciprocal device for one photon but demonstrates nonreciprocal light transmission for two photons, functioning as an optical diode.

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    Area of Science:

    • Quantum optics
    • Solid-state physics
    • Nonlinear optics

    Background:

    • Chirally coupled waveguide-resonator systems are crucial for studying quantum phenomena.
    • Nonlinear optical effects in such systems can lead to novel functionalities.
    • Understanding photon transport at the quantum level is essential for quantum technologies.

    Purpose of the Study:

    • To investigate the coherent transport of one and two photons in a chiral waveguide-nonlinear resonator system.
    • To analyze the reciprocal and nonreciprocal transmission properties of the system.
    • To determine if the system can function as an optical diode at the quantum level.

    Main Methods:

    • Derivation of analytic solutions for one-photon and two-photon scattering.
    • Analysis of transmission probabilities for different photon numbers and incidence directions.
    • Modeling of light-matter interaction in a chiral waveguide coupled to a nonlinear resonator.

    Main Results:

    • One-photon transmission is reciprocal despite the nonlinear resonator acting as a non-reciprocal phase shifter.
    • Two-photon transmission exhibits nonreciprocity, with different forward and reverse probabilities.
    • Nonreciprocity in two-photon transport arises from energy redistribution within a two-photon bound state.

    Conclusions:

    • The chiral waveguide-nonlinear resonator system displays distinct behaviors for one and two photons.
    • The system acts as a reciprocal device for single photons.
    • The nonlinear resonator enables optical diode functionality at the two-photon level due to quantum effects.