Conditional rotation of two strongly coupled semiconductor charge qubits

Hai-Ou Li, Gang Cao, Guo-Dong Yu, Ming Xiao (), Guang-Can Guo, Hong-Wen Jiang and Guo-Ping Guo ()
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Hai-Ou Li: Key Laboratory of Quantum Information, CAS, University of Science and Technology of China
Gang Cao: Key Laboratory of Quantum Information, CAS, University of Science and Technology of China
Guo-Dong Yu: Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China
Ming Xiao: Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China
Guang-Can Guo: Key Laboratory of Quantum Information, CAS, University of Science and Technology of China
Hong-Wen Jiang: University of California
Guo-Ping Guo: Key Laboratory of Quantum Information, CAS, University of Science and Technology of China

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract Universal multiple-qubit gates can be implemented by a set of universal single-qubit gates and any one kind of entangling two-qubit gate, such as a controlled-NOT gate. For semiconductor quantum dot qubits, two-qubit gate operations have so far only been demonstrated in individual electron spin-based quantum dot systems. Here we demonstrate the conditional rotation of two capacitively coupled charge qubits, each consisting of an electron confined in a GaAs/AlGaAs double quantum dot. Owing to the strong inter-qubit coupling strength, gate operations with a clock speed up to 6 GHz have been realized. A truth table measurement for controlled-NOT operation shows comparable fidelities to that of spin-based two-qubit gates, although phase coherence is not explicitly measured. Our results suggest that semiconductor charge qubits have a considerable potential for scalable quantum computing and may stimulate the use of long-range Coulomb interaction for coherent quantum control in other devices.

Date: 2015
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DOI: 10.1038/ncomms8681

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