Ultrafast universal quantum control of a quantum-dot charge qubit using Landau–Zener–Stückelberg interference

Gang Cao, Hai-Ou Li, Tao Tu, Li Wang, Cheng Zhou, Ming Xiao, Guang-Can Guo, Hong-Wen Jiang and Guo-Ping Guo ()
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Gang Cao: Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences
Hai-Ou Li: Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences
Tao Tu: Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences
Li Wang: Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences
Cheng Zhou: Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences
Ming Xiao: Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences
Guang-Can Guo: Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences
Hong-Wen Jiang: University of California at Los Angeles
Guo-Ping Guo: Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract A basic requirement for quantum information processing is the ability to universally control the state of a single qubit on timescales much shorter than the coherence time. Although ultrafast optical control of a single spin has been achieved in quantum dots, scaling up such methods remains a challenge. Here we demonstrate complete control of the quantum-dot charge qubit on the picosecond scale. We observe tunable qubit dynamics in a charge-stability diagram, in a time domain, and in a pulse amplitude space of the driven pulse. The observations are well described by Landau–Zener–Stückelberg interference. These results establish the feasibility of a full set of all-electrical single-qubit operations. Although our experiment is carried out in a solid-state architecture, the technique is independent of the physical encoding of the quantum information and has the potential for wider applications.

Date: 2013
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DOI: 10.1038/ncomms2412

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