Realization of adiabatic and diabatic CZ gates in superconducting qubits coupled with a tunable coupler

• 作者: Huikai Xu Weiyang Liu Zhiyuan Li Jiaxiu Han Jingning Zhang Kehuan Linghu Yongchao Li Mo Chen Zhen Yang Junhua Wang Teng Ma Guangming Xue Yirong Jin Haifeng Yu
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: SPECIAL TOPIC—Quantum computation and quantum simulation
• 页码范围: 88-93
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/abf03a

摘要

High fidelity two-qubit gates are fundamental for scaling up the superconducting qubit number.We use two qubits coupled via a frequency-tunable coupler which can adjust the coupling strength,and demonstrate the CZ gate using two different schemes,adiabatic and diabatic methods.The Clifford based randomized benchmarking(RB)method is used to assess and optimize the CZ gate fidelity.The fidelities of adiabatic and diabatic CZ gates are 99.53(8)％and 98.72(2)％,respectively.We also analyze the errors induced by the decoherence.Comparing to 30 ns duration time of adiabatic CZ gate,the duration time of diabatic CZ gate is 19 ns,revealing lower incoherence error rate r'incoherent,int = 0.0197(5)compared to rincoherent,int = 0.0223(3).