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    We demonstrate a novel method for achieving asymmetric synchronous photon blockade (PB) by controlling pump light direction in coupled optical cavities. This allows selective generation of single or dual cavity PB for efficient single-photon sources.

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    Area of Science:

    • Quantum optics
    • Nonlinear optics
    • Photonics

    Background:

    • Photon blockade (PB) is crucial for generating non-classical light.
    • Existing methods often lack flexibility in controlling PB types.
    • Efficient single-photon sources are vital for quantum technologies.

    Purpose of the Study:

    • To propose a flexible scheme for achieving asymmetric synchronous photon blockade (PB).
    • To enable selective realization of single-cavity PB or two-cavity synchronous PB.
    • To enhance single-photon heralding efficiency and collection rates.

    Main Methods:

    • Utilizing two coupled optical cavities interacting via a nonlinear crystal.
    • Modulating the input direction of pump light to induce asymmetric processes.
    • Analyzing the system's response using parametric up- and down-conversion.
    • Employing delayed correlation functions to assess temporal resolution.

    Main Results:

    • Achieved selective single-cavity and two-cavity synchronous PB by tuning pump light direction.
    • Demonstrated asymmetry in PB due to directional parametric processes.
    • Confirmed high temporal resolution of synchronized single photons.
    • Showcased the scheme's tunability without component modification.

    Conclusions:

    • The proposed scheme offers flexible control over different PB regimes.
    • Two-cavity synchronous PB provides an efficient single-photon heralding mechanism.
    • This approach addresses limitations in collection efficiency for probabilistic single-photon sources.