29 March 2013 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
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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.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kristiaan De Greve, Kristiaan De Greve, Peter L. McMahon, Peter L. McMahon, Leo Yu, Leo Yu, Jason S. Pelc, Jason S. Pelc, Chandra M. Natarajan, Chandra M. Natarajan, David Press, David Press, Na Young Kim, Na Young Kim, Eisuke Abe, Eisuke Abe, Dirk Bisping, Dirk Bisping, Sebastian Maier, Sebastian Maier, Christian Schneider, Christian Schneider, Martin Kamp, Martin Kamp, Sven Höfling, Sven Höfling, Robert H. Hadfield, Robert H. Hadfield, Alfred Forchel, Alfred Forchel, M. M. Fejer, M. M. Fejer, Yoshihisa Yamamoto, Yoshihisa Yamamoto, } "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", Proc. SPIE 8635, Advances in Photonics of Quantum Computing, Memory, and Communication VI, 86350B (29 March 2013); doi: 10.1117/12.2001931; https://doi.org/10.1117/12.2001931
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