Introduction of quantum magnonics

2015 Fiscal Year Final Research Report

• Project/Area Number: 26600071
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: The University of Tokyo
• Principal Investigator: Nakamura Yasunobu 東京大学, 先端科学技術研究センター, 教授 (90524083)
• Co-Investigator(Renkei-kenkyūsha): USAMI Koji 東京大学, 先端科学技術研究センター, 准教授 (90500116) ; YAMAZAKI Rekishu 東京大学, 先端科学技術研究センター, 助教 (00551409) ; TABUCHI Yutaka 東京大学, 先端科学技術研究センター, 特別研究員
• Research Collaborator: ISHIKAWA Toyofumi ; NOGUCHI Atsushi ; HISATOMI Ryusuke ; OSADA Alto ; ISHINO Seiichiro
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 強磁性体 / マグノン / 強磁性共鳴 / ガーネット

Outline of Final Research Achievements

We demonstrated quantum state control of collective spin excitations in a ferromagnetic insulator. We coupled coherently magnon excitation in a millemeter-scale magnet (a sphere of single-crystal yttrium ion garnet) with a superconducting qubit via a microwave cavity mode. It enabled us to control and measure the quantum state in the single-magnon level. The results establish a new research field dubbed "quantum magnonics" which bridges the long-lifetime spin excitations in ferromagnetic insulators frequently used in the field of spintronics with quantum state engineering as well as quantum information science.

Free Research Field

量子情報物理工学