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Fast Spin State Initialization in a Singly Charged InAs-GaAs Quantum Dot by Optical Cooling

2007; American Physical Society; Volume: 99; Issue: 9 Linguagem: Inglês

10.1103/physrevlett.99.097401

1092-0145

Xiaodong Xu, Yanwen Wu, Bo Sun, Qiong Huang, Jun Cheng, D. G. Steel, Allan S. Bracker, D. Gammon, Clive Emary, L. J. Sham,

Quantum Information and Cryptography

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.