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Anomalous Long-Distance Coherence in Critically Driven Cavity Magnonics.

Ying Yang1, Jiguang Yao1, Yang Xiao2

  • 1Department of Physics and Astronomy, University of Manitoba, Winnipeg R3T 2N2, Canada.

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This summary is machine-generated.

Researchers achieved long-distance magnon-photon coherence in cavity magnonics, establishing strong coupling over 2 meters. This breakthrough utilizes critical coupling phenomena for future quantum networks.

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Area of Science:

  • Quantum physics
  • Quantum information science
  • Cavity magnonics

Background:

  • Quantum networks require remote strong coupling for coherent connections.
  • Cavity magnonics offers a platform for studying quantum phenomena.

Purpose of the Study:

  • To demonstrate long-distance coherence in cavity magnonics.
  • To explore the role of critical coupling in establishing remote strong coupling.

Main Methods:

  • Operating cavity magnonics in the linear regime.
  • Locally setting the cavity near critical coupling with traveling photons.
  • Establishing nonlocal magnon-photon coherence via strong coupling over a 2-m distance.

Main Results:

  • Demonstrated long-distance magnon-photon coherence over 2 meters.
  • Observed anomalous oscillations in coupling strength.
  • Observed clear mode splitting within the cavity linewidth.
  • Identified phenomena not explained by conventional coupled-mode theory.

Conclusions:

  • Critical coupling phenomena are crucial for harnessing long-distance coherence.
  • This work advances the development of quantum networks.
  • Potential for using critical phenomena in distributed quantum systems.