Fast spin state initialization in a singly charged InAs-GaAs quantum dot by optical cooling |
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Authors: | Xu Xiaodong Wu Yanwen Sun Bo Huang Qiong Cheng Jun Steel D G Bracker A S Gammon D Emary C Sham L J |
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Affiliation: | The H.M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA. |
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Abstract: | 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. |
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