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    Area of Science:

    • Quantum optics
    • Photonics
    • Atomic physics

    Background:

    • Classical antenna theory prohibits coherent isotropic radiators.
    • Thermal radiators are isotropic but lack temporal coherence.
    • Achieving isotropic and coherent single-photon emission is crucial for quantum applications.

    Purpose of the Study:

    • To demonstrate quantum interference enabling isotropic and unpolarized single-photon sources.
    • To show these sources can preserve temporal coherence.
    • To explore practical implementations for atomic and solid-state systems.

    Main Methods:

    • Utilizing quantum interference processes.
    • Designing multilevel emitters with degenerate ground states.
    • Analyzing the properties of emitted single photons.

    Main Results:

    • Successfully designed single-photon sources that are both isotropic and unpolarized.
    • Demonstrated preservation of temporal coherence in these quantum sources.
    • Identified feasible implementations using multilevel emitters.

    Conclusions:

    • Quantum interference offers a pathway to overcome classical limitations in radiator design.
    • Isotropic, unpolarized, and temporally coherent single-photon sources are achievable.
    • Potential applications exist in atomic and solid-state quantum technologies.