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Magnon-mediated nonreciprocal microwave transmission based on quantum interference.

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    Researchers demonstrate a novel method for nonreciprocal microwave transmission using superconducting cavities and ferrimagnetic materials. This technique offers tunable light isolation, crucial for advanced signal processing and quantum information applications.

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    Area of Science:

    • Quantum physics
    • Solid-state physics
    • Microwave engineering

    Background:

    • Nonreciprocity is essential for applications like signal processing and noise isolation.
    • Implementing nonreciprocal devices often requires complex designs.

    Purpose of the Study:

    • To propose a simple and feasible scheme for nonreciprocal microwave transmission.
    • To explore the use of ferrimagnetic materials in superconducting cavities for this purpose.

    Main Methods:

    • Coupling a magnon mode with two microwave modes in a high-quality-factor superconducting cavity.
    • Utilizing quantum interference between transmission paths to break time-reversal symmetry.
    • Modulating photon-magnon coupling strength and adjusting a static magnetic field.

    Main Results:

    • Achieved tunable nonreciprocal microwave transmission.
    • Demonstrated high light isolation controllable via magnetic field strength.
    • Verified the role of quantum interference and broken time-reversal symmetry.

    Conclusions:

    • The proposed scheme offers a simple and tunable method for nonreciprocal transmission.
    • The results facilitate potential applications in magnetic sensing and coherent information processing.