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Meterscale Strong Coupling between Magnons and Photons.

Jinwei Rao1, C Y Wang1, Bimu Yao1,2

  • 1School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.

Physical Review Letters
|September 22, 2023
PubMed
Summary
This summary is machine-generated.

Researchers achieved room-temperature, meterscale strong coupling between magnons and photons using an active microwave cavity. This breakthrough enables remote control of photon-magnon coupling, paving the way for cavity magnonics information networks.

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Microwave engineering

Background:

  • Strong coupling between magnons and photons is crucial for quantum information processing.
  • Achieving long-range coupling in cavity magnonics has been a significant challenge.

Purpose of the Study:

  • To experimentally realize meterscale strong coupling between magnons and photons at room temperature.
  • To demonstrate remote control of photon-magnon coupling.
  • To provide a general method for long-range strong coupling in physical systems.

Main Methods:

  • Integration of a saturable gain into a microwave cavity.
  • Coupling the active cavity to a magnon mode via a long coaxial cable.
  • Utilizing traveling waves for remote control of coupling parameters.

Main Results:

  • Experimental realization of meterscale strong coupling with coherent coupling of ~20 m and dissipative coupling of ~7.6 m.
  • Demonstration of remote control over photon-magnon coupling by modulating traveling wave phase and amplitude.
  • Gain compensation for cavity dissipation while preserving mediating radiation.

Conclusions:

  • The developed method enables long-range strong photon-magnon coupling.
  • The findings offer a generalizable approach for other physical systems.
  • This work may advance the development of information networks based on cavity magnonics.