Fast Spin State Initialization in a Singly Charged InAs-GaAs Quantum Dot by Optical Cooling
Xiaodong Xu(University of Michigan–Ann Arbor), Yanwen Wu(University of Michigan–Ann Arbor), Bo Sun(University of Michigan–Ann Arbor), Qiong Huang(University of Michigan–Ann Arbor), Jun Cheng(University of Michigan–Ann Arbor), D. G. Steel(University of Michigan–Ann Arbor), Allan S. Bracker(United States Naval Research Laboratory), D. Gammon(United States Naval Research Laboratory), Clive Emary(University of California, San Diego), L. J. Sham(University of California, San Diego)
Cited by 284
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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