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    We developed a new fiber-integrated optical microresonator that works at cryogenic temperatures. This advances solid-state quantum optics and quantum hybrid systems by enhancing light-matter coupling.

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    Area of Science:

    • Quantum Optics
    • Nanophotonics
    • Materials Science

    Background:

    • Solid-state quantum optics requires cryogenic environments for optimal performance.
    • Efficient coupling between quantum emitters and optical cavities is crucial for quantum technologies.
    • Existing microresonators often lack cryogenic compatibility or require complex alignment.

    Purpose of the Study:

    • To demonstrate a cryo-compatible, fiber-integrated, and alignment-free optical microresonator.
    • To enhance light-matter coupling for quantum emitters.
    • To enable applications in quantum hybrid systems and solid-state quantum optics.

    Main Methods:

    • Fabrication of a fully fiber-integrated optical microresonator.
    • Testing the microresonator's performance at cryogenic temperatures (4.6 K).
    • Characterization of the quality factor and Purcell factor.

    Main Results:

    • Achieved a quality factor of (9.9 ± 0.7) × 10^6 at 4.6 K.
    • Demonstrated a Purcell factor of up to 15 due to the small mode volume.
    • Confirmed cryo-compatibility and alignment-free operation.

    Conclusions:

    • The developed microresonator is suitable for cryogenic applications in quantum optics.
    • It significantly enhances coupling between light and various quantum emitters.
    • Its performance over a wide temperature range makes it ideal for quantum hybrid systems.