Conditional rotation of two strongly coupled semiconductor charge qubits

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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.

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Li, H. O., Cao, G., Yu, G. D., Xiao, M., Guo, G. C., Jiang, H. W., & Guo, G. P. (2015). Conditional rotation of two strongly coupled semiconductor charge qubits. Nature Communications, 6. https://doi.org/10.1038/ncomms8681

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