Experimental Realization of a Fast Controlled-Z Gate via a Shortcut to Adiabaticity

Tenghui Wang, Zhenxing Zhang, Liang Xiang, Zhilong Jia, Peng Duan, Zhiwen Zong, Zhenhai Sun, Zhangjingzi Dong, Jianlan Wu, Yi Yin, and Guoping Guo

Phys. Rev. Applied 11, 034030 – Published 13 March 2019

Abstract

For a frequency-tunable two-qubit system, a controlled-Z (cz) gate can be realized by adiabatic driving of the qubit system through an avoided level crossing between an auxiliary state and computational levels. Here we theoretically propose a fast cz gate using a shortcut to adiabaticity (STA). Experimentally, the STA cz gate is implemented with a 52-ns control pulse for two coupled superconducting Xmon qubits. The measured fidelity of the STA cz gate is higher than 96.0% in both quantum-process tomography and randomized benchmarking. The protocol allows a flexible design of the evolution time and control waveform. We suggest that this “fast adiabatic” cz gate can be directly applied to other multiqubit quantum systems.

Received 22 November 2018
Revised 4 January 2019

DOI:https://doi.org/10.1103/PhysRevApplied.11.034030

Physics Subject Headings (PhySH)

Quantum control Quantum gates Quantum information with solid state qubits

Superconducting qubits

Quantum Information, Science & Technology

Authors & Affiliations

Tenghui Wang¹, Zhenxing Zhang¹, Liang Xiang¹, Zhilong Jia², Peng Duan², Zhiwen Zong¹, Zhenhai Sun¹, Zhangjingzi Dong¹, Jianlan Wu¹, Yi Yin^1,*, and Guoping Guo^2,†

¹Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou, 310027, China
²Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, China

^*yiyin@zju.edu.cn
^†gpguo@ustc.edu.cn

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Vol. 11, Iss. 3 — March 2019

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Physical Review Applied