Realization of High-Fidelity Controlled-Phase Gates in Extensible Superconducting Qubits Design with a Tunable Coupler

叶杨森; 曹思睿; 吴玉林; 陈厦微; 朱庆玲; 李少炜; 陈福升; 龚明; 查辰; 黄合良; 赵有为; 王石宇; 郭少俊; 钱浩然; 梁福田; 林金; 徐昱; 郭成; 孙丽华; 李娜; 邓辉; 朱晓波; 潘建伟

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Realization of High-Fidelity Controlled-Phase Gates in Extensible Superconducting Qubits Design with a Tunable Coupler

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High-fidelity two-qubit gates are essential for the realization of large-scale quantum computation and simulation.Tunable coupler design is used to reduce the problem of parasitic coupling and frequency crowding in manyqubit systems and thus thought to be advantageous. Here we design an extensible 5-qubit system in which center transmon qubit can couple to every four near-neighboring qubits via a capacitive tunable coupler and experimentally demonstrate high-fidelity controlled-phase(CZ) gate by manipulating central qubit and one nearneighboring qubit. Speckle purity benchmarking and cross entropy benchmarking are used to assess the purity fidelity and the fidelity of the CZ gate. The average purity fidelity of the CZ gate is 99.69±0.04% and the average fidelity of the CZ gate is 99.65±0.04%, which means that the control error is about 0.04%. Our work is helpful for resolving many challenges in implementation of large-scale quantum systems.

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《中国物理快报：英文版》 |2021年第10期|1-5|共5页
作者
叶杨森; 曹思睿; 吴玉林; 陈厦微; 朱庆玲; 李少炜; 陈福升; 龚明; 查辰; 黄合良; 赵有为; 王石宇; 郭少俊; 钱浩然; 梁福田; 林金; 徐昱; 郭成; 孙丽华; 李娜; 邓辉; 朱晓波; 潘建伟;
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作者单位

Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics;

University of Science and Technology of China;

Hefei 230026;

China;

Shanghai Branch;

CAS Center for Excellence in Quantum Information and Quantum Physics;

University of Science and Technology of China;

Shanghai 201315;

China;

Shanghai Research Center for Quantum Sciences;

Shanghai 201315;

China;

Henan Key Laboratory of Quantum Information and Cryptography;

Zhengzhou 450000;

China;

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原文格式 PDF
正文语种 chi
中图分类量子论;
关键词
purity; neighboring; quantum;

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3. Implementation of a Controlled-Phase Gate and Deutsch-Jozsa Algorithm with Superconducting Charge Qubits in a Cavity [J] . SONG Ke-Hui ,ZHOU Zheng-Wei ,GUO Guang-Can . 理论物理通讯：英文版 . 2007,第5期
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Realization of High-Fidelity Controlled-Phase Gates in Extensible Superconducting Qubits Design with a Tunable Coupler

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