Fast spin state initialization in a singly charged InAs-GaAs quantum dot by optical cooling

Quantum computation requires a continuous supply of rapidly initialized qubits for quantum error correction. Here, we demonstrate fast spin state initialization with near unity efficiency in a singly charged quantum dot by optically cooling an electron spin. The electron spin is successfully cooled...

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Bibliographic Details
Published in:Physical review letters 2007-08, Vol.99 (9), p.097401-097401, Article 097401
Main Authors: Xu, Xiaodong, Wu, Yanwen, Sun, Bo, Huang, Qiong, Cheng, Jun, Steel, D G, Bracker, A S, Gammon, D, Emary, C, Sham, L J
Format: Article
Language:English
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Summary:Quantum computation requires a continuous supply of rapidly initialized qubits for quantum error correction. Here, we demonstrate fast spin state initialization with near unity efficiency in a singly charged quantum dot by optically cooling an electron spin. The electron spin is successfully cooled from 5 to 0.06 K at a magnetic field of 0.88 T applied in Voigt geometry. The spin cooling rate is of order 10(9) s-1, which is set by the spontaneous decay rate of the excited state.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.99.097401