303rd RQC Seminar

• 講演者

  Prof. Jian-Qiang You
  ( School of Physics, Zhejiang University, China )

• 日程

  2026年9月29日(火), 16:00 - 17:00(4:00 p.m.-5:00 p.m.)

• 開催場所

  ハイブリッド（Zoom,
  345-347 Seminar Room, 3F, Main Research Building, Wako Campus / 和光地区 研究本館3階 セミナー室 (345-347) (C01)）

• 講演タイトル

  From quantum magnonics to macroscopic magnon qubit

• お問合せ

  norilab_rqc_assist[at]ml.riken.jp

講演概要
Quantum magnonics has emerged as a new research frontier bridging quantum physics and condensed matter physics. This presentation outlines the background of this field and highlights the very recent progress. Firstly, I present the quantum control of a single magnon, including the deterministic generation of a single-magnon state and its coherent superposition with the vacuum (zero-magnon state) [1]. Secondly, I report magnon squeezing achieved in the quantum regime, demonstrating this key phenomenon in quantum nonlinear magnonics [2]. Thirdly, by further enhancing the magnon blockade effect, we demonstrate that the system functions as a coherent, macroscopic magnon qubit [3], showcasing its potential for quantum information applications.

References
[1] D. Xu, X.K. Gu, H.K. Li, Y.C. Weng, Y.P. Wang, J. Li, H. Wang, S.Y. Zhu, and J.Q. You, Quantum control of a single magnon in a macroscopic spin system, Phys. Rev. Lett., 130, 193603 (2023).
[2] Y.C. Weng, D. Xu, Z. Chen, L.Z. Tan, X.K. Gu, J. Li, H.F. Yu, S.Y. Zhu, X. Hu, F. Nori, and J.Q. You, Magnon squeezing in the quantum regime, Nat. Commun. 17, 2679 (2026).
[3] L.Z. Tan, Z. Chen, A.L. Tan, Y.C. Weng, X.K. Gu, H. Yu, X. Hu, F. Nori and J.Q. You, Macroscopic magnon qubit, submitted.