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Proceedings Paper

Ultrafast optical control of individual electron and hole spin qubits: entanglement between a single quantum dot electron spin and a downconverted 1560-nm single photon
Author(s): Kristiaan De Greve; Peter L. McMahon; Leo Yu; Jason S. Pelc; Chandra M. Natarajan; David Press; Na Young Kim; Eisuke Abe; Dirk Bisping; Sebastian Maier; Christian Schneider; Martin Kamp; Sven Höfling; Robert H. Hadfield; Alfred Forchel; M. M. Fejer; Yoshihisa Yamamoto
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Paper Abstract

Individual electron and hole quantum dot spin qubits can be coherently manipulated using picosecond modelocked laser pulses; an all-optical spin-echo was implemented that decouples slow environmental changes. While dephasing and decoherence mechanisms for electrons and holes are intrinsically different, similar qualitative results are obtained, except for dynamic nuclear polarization effects that affect the controllability of electrons. In addition, we demonstrate spin-photon entanglement in a charged InAs quantum dot, using an ultrafast downconversion technique that converts a single, spontaneously emitted photon at 900 nm into a 1560 nm photon with picosecond timing resolution. This ultrafast conversion technique allows quantum erasure of which-path frequency information in the spontaneous emission process.

Paper Details

Date Published: 29 March 2013
PDF: 11 pages
Proc. SPIE 8635, Advances in Photonics of Quantum Computing, Memory, and Communication VI, 86350B (29 March 2013); doi: 10.1117/12.2001931
Show Author Affiliations
Kristiaan De Greve, Stanford Univ. (United States)
Peter L. McMahon, Stanford Univ. (United States)
Leo Yu, Stanford Univ. (United States)
Jason S. Pelc, Stanford Univ. (United States)
Chandra M. Natarajan, Stanford Univ. (United States)
Heriot-Watt Univ. (United Kingdom)
David Press, Stanford Univ. (United States)
Na Young Kim, Stanford Univ. (United States)
Eisuke Abe, Stanford Univ. (United States)
National Institute of Informatics (Japan)
Dirk Bisping, Julius-Maximilians-Univ. Würzburg (Germany)
Sebastian Maier, Julius-Maximilians-Univ. Würzburg (Germany)
Christian Schneider, Julius-Maximilians-Univ. Würzburg (Germany)
Martin Kamp, Julius-Maximilians-Univ. Würzburg (Germany)
Sven Höfling, Stanford Univ. (United States)
Julius-Maximilians-Univ. Würzburg (Germany)
Robert H. Hadfield, Heriot-Watt Univ. (United Kingdom)
Alfred Forchel, Julius-Maximilians-Univ. Würzburg (Germany)
M. M. Fejer, Stanford Univ. (United States)
Yoshihisa Yamamoto, Stanford Univ. (United States)
National Institute of Informatics (Japan)

Published in SPIE Proceedings Vol. 8635:
Advances in Photonics of Quantum Computing, Memory, and Communication VI
Zameer U. Hasan; Philip R. Hemmer; Hwang Lee; Charles M. Santori, Editor(s)

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