Single-spin resonance enhancement using spin shuttle

2019 Fiscal Year Final Research Report

• Project/Area Number: 18K13482
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
• Research Institution: Osaka University
• Principal Investigator: Fujita Takafumi 大阪大学, 産業科学研究所, 助教 (00809642)
• Project Period (FY): 2018-04-01 – 2020-03-31
• Keywords: 電子スピン共鳴 / 量子ドット / スピン軌道相互作用 / 単一電子スピン / 1次元多重量子ドット

Outline of Final Research Achievements

Single spin shuttling is a technique to move a single electron spin between multiple sites of artificial atoms called quantum dots. There is another technique called electric dipole spin resonance, where an oscillating electric field forces an electron spin resonance if the resulting charge oscillating can produce an effective oscillating magnetic field. In this research, we combined these two techniques to realize a charge oscillation between multiple quantum dots using the same microwave applied for spin resonance, resulting in a largely enhanced charge oscillation thus effective magnetic filed. Our achievement is an order of magnitude enhanced Rabi oscillation, which is as fast as 200 MHz and faster than the contemporary single spin manipulation techniques. We predict that this can further increase by using the well-known micromagnet technique.

Free Research Field

半導体量子ドット

Academic Significance and Societal Importance of the Research Achievements

量子ドット様の閉じ込め間を電場を使ってスピンが移動する仕組みを整えられれば、スピン共鳴を増幅できる点から、材料系によらずにスピン共鳴を起こす新たな可能性を実証できた点に意義がある。そして、半導体電子スピンを基盤とする、量子情報ハードウェアの分野に直接貢献する成果である。半導体における量子情報は、メモリーの課題が取り上げられているが、スピン操作の速度を桁違いの増幅することで相対的に利用の幅を広げた。