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26 April 2024

» arxiv » 1811.8096

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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 ; Guoping Guo ;
Date:	20 Nov 2018
Abstract:	For a frequency-tunable two-qubit system, a controlled-Z (CZ) gate can be realized by adiabatically driving 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. 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 multi-qubit quantum systems.
Source:	arXiv, 1811.8096
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