北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2024, Vol. 47 ›› Issue (6): 11-17.

• • 上一篇    

基于超导约瑟夫森结的量子比特系统实验研究

栾添1,2,高岩松1,匡学衡1,孙晓培1,陆军1,2   

  1. 1.量子科技长三角产业创新中心

    2.中国电子科学研究院

  • 收稿日期:2023-12-21 修回日期:2024-03-05 出版日期:2024-12-28 发布日期:2024-10-29
  • 通讯作者: 栾添 E-mail:luantian@ tgqs. net
  • 基金资助:
    姑苏创新创业领军人才计划项目(ZXL2022424)

Experimental System Research on Superconducting Qubits Based on Josephson Junctions

  • Received:2023-12-21 Revised:2024-03-05 Online:2024-12-28 Published:2024-10-29

摘要: 使用频率可调的传输子结构量子比特,设计了一种单链形式的二十比特量子芯片,利用定制化的低温环境控制系统和低温同轴线缆组件,完成了所有量子比特的基本表征实验,超导量子比特的能量退相干时间最高可达31.3 μs,相位退相干时间最高可达22.8 μs,随机基准测试单比特门平均保真度可达99.85%,量子过程层析测量得到的两比特受控Z门保真度为97.5%。基于单比特门和两比特门的编织量子线路演示了量子动力学模拟算法,观察到伊辛模型的动力学演化过程。

关键词: 量子计算, 超导量子比特, 量子算法

Abstract: A single-chain twenty-qubit quantum chip was designedWe design a single chain twenty qubits chip by using frequency adjustable transmon structure. We performed basic characterization experiments on all qubits using a customized low-temperature environment control system and low-temperature coaxial cable components, which have attained chieving a maximum energy decoherence time T1 of 31.3 μs and a phase decoherence time T2* of 22.8 μs among all qubits. An average fidelity of 99.85% for of single-qubit gates was gained as determined by random benchmark testing. The two-qubit Controlled-ZZ gate calibration was also achieved, with a fidelity of 97.5% measured through quantum process tomography. Finally, we demonstrated a quantum dynamics simulation algorithm based on the operation of single-qubits gates and double-qubits gates, successfully observing the dynamical evolution of the Ising model.

Key words: quantum computing, superconducting qubit, quantum algorithm

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