Quantum state transfer from a photon to an electron spin in a quantum dot

2015 Fiscal Year Final Research Report

• Project/Area Number: 24244044
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Yokohama National University (2013, 2015); Tohoku University (2012, 2014)
• Principal Investigator: Kosaka Hideo 横浜国立大学, 工学(系)研究科(研究院), 教授 (20361199)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 量子エレクトロニクス / スピントロニクス / 光物性 / 量子井戸 / 量子ドット

Outline of Final Research Achievements

We succeeded experiments for quantum entanglement absorption to detect the entanglement between a ground state electron in an NV center and an incoming photon (published in Physical Review Letters), and quantum state transfer from a photon to a ground state electron based on the quantum teleportation scheme (published in Nature Photonics). Transfer fidelity of over 90% was achieved by purifying the transfer events based on post-selection. We also succeeded to prolong the quantum memory time (phase relaxation time) over 100 times by the developed geometric spin echo (published in Nature Communications). The phase relaxation time of world-longest 1.9 ms was achieved by repeating the echo.

Free Research Field

スピンエレクトロニクス