Quantum magnonics: magnon meets superconducting qubit

  1. Yutaka Tabuchi,
  2. Seiichiro Ishino,
  3. Atsushi Noguchi,
  4. Toyofumi Ishikawa,
  5. Rekishu Yamazaki,
  6. Koji Usami,
  7. and Yasunobu Nakamura
The techniques of microwave quantum optics are applied to collective spin excitations in a macroscopic sphere of ferromagnetic insulator. We demonstrate, in the single-magnon limit, strong coupling between a magnetostatic mode in the sphere and a microwave cavity mode. Moreover, we introduce a superconducting qubit in the cavity and couple the qubit with the magnon excitation via the virtual photon excitation. We observe the magnon-vacuum-induced Rabi splitting. The hybrid quantum system enables generation and characterization of non-classical quantum states of magnons.
arxiv pdf

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