Quantum magnonics: The magnon meets the superconducting qubit

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• 作者：Yutaka Tabuchi^a ; ^{tabuchi@qc.rcast.u-tokyo.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Seiichiro Ishino^a ; Atsushi Noguchi^a ; Toyofumi Ishikawa^a ; Rekishu Yamazaki^a ; Koji Usami^a ; Yasunobu Nakamura^a ; ^b
• 关键词：Magnon ; Ferromagnet ; Yttrium-iron garnet ; Superconducting qubit ; Microwave ; Quantum optics
• 刊名：Comptes Rendus Physique
• 出版年：2016
• 出版时间：August-September 2016
• 年：2016
• 卷：17
• 期：7
• 页码：729-739
• 全文大小：2669 K

文摘

The techniques of microwave quantum optics are applied to collective spin excitations in a macroscopic sphere of a 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.