Studies on quantum state transfer and creation of entanglement between photons and electron spins using quantum dots

2016 Fiscal Year Final Research Report

• Project/Area Number: 25246005
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nanostructural physics
• Research Institution: Osaka University (2014-2016); The University of Tokyo (2013)
• Principal Investigator: OIWA Akira 大阪大学, 産業科学研究所, 教授 (10321902)
• Co-Investigator(Kenkyū-buntansha): 山本 倫久 東京大学, 工学(系)研究科(研究院), 講師 (00376493) ; 樽茶 清悟 東京大学, 工学(系)研究科(研究院), 教授 (40302799)
• Research Collaborator: WIECK Andreas D. Ruhr-Universität
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 量子ドット / 光子 / 電子スピン / 量子状態転写 / 量子中継 / 量子もつれ

Outline of Final Research Achievements

Studies on quantum communications and quantum computing, of which operating principles are based on quantum mechanics, are rapidly developing because of the demands on secure, large capacity, and high speed information processing. In this work, we aim at realizing the basic technologies of quantum repeaters indispensable for quantum communications using electron spins confined in electrically controllable quantum dots (QDs). First, we achieved the detection of single photo-electron spins and verified the angular momentum transfer between circularly polarized photons and electron spins, indicating the feasibility of quantum state transfer. Furthermore, we accomplished the simultaneous detections of a photon of an entangled photon pair and an electron generated by the other photon of the pair in a QD. For the first time to the electrically controllable QDs, we obtained a crucial achievement toward entanglement distribution among remote locations, which is required for quantum repeaters.

Free Research Field

半導体低次元物性