量子计算机辅助设计先进的超导量子比特:Plasmonium  

Quantum computer-aided design for advanced superconducting qubit:Plasmonium

作　　者：刘丰铭 王粲 陈明城 陈贺 李少炜 尚仲夏 应翀 王建文 霍永恒 彭承志 朱晓波 陆朝阳 潘建伟 Feng-Ming Liu;Can Wang;Ming-Cheng Chen;He Chen;Shao-Wei Li;Zhong-Xia Shang;Chong Ying;Jian-Wen Wang;Yong-Heng Huo;Cheng-Zhi Peng;Xiaobo Zhu;Chao-Yang Lu;Jian-Wei Pan(Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China;Shanghai Branch CAS Centre for Excellence and Synergetic Innovation Centre 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)

机构地区：[1]Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China [2]Shanghai Branch CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics,University of Science and Technology of China,Shanghai 201315,China [3]Shanghai Research Center for Quantum Sciences,Shanghai 201315,China

出　　处：《Science Bulletin》2023年第15期1625-1631,M0004,共8页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(91836303 and 11805197);the National Key R&D Program of China;the Chinese Academy of Sciences;the Anhui Initiative in Quantum Information Technologies;the Science and Technology Commission of Shanghai Municipality(2019SHZDZX01)。

摘　　要：复杂的超导量子电路可以用来设计对噪声免疫的量子比特,但其复杂性可能会超出经典计算机所具备的模拟能力.在这种情况下,可以借助量子计算机来对其进行高效的模拟.在这项工作中,作者展示了在基于transmon比特的量子计算机上,利用变分量子算法模拟一种超导量子电路,并且基于此设计了一种新的量子比特“Plasmonium”,它工作在等离子体跃迁区域.文中展示的Plasmonium量子比特展示出了较高的两比特门保真度99.58(3)%.相比于transmon比特,它具有更小的物理尺寸和更大的非谐性.这些特征使得Plasmonium可以成为制造多比特量子处理器强有力的候选者.这项研究结果证实了利用量子计算机辅助设计更先进的量子处理器的可能性.Complex quantum electronic circuits can be used to design noise-protected qubits,but their complexity may exceed the capabilities of classical simulation.In such cases,quantum computers are necessary for efficient simulation.In this work,we demonstrate the use of variational quantum computing on a transmon-based quantum processor to simulate a superconducting quantum electronic circuit and design a new type of qubit called"Plasmonium",which operates in the plasmon-transition regime.The fabricated Plasmonium qubits show a high two-qubit gate fidelity of 99.58(3)%,as well as a smaller physical size and larger anharmonicity compared to transmon qubits.These properties make Plasmonium a promising candidate for scaling up multi-qubit devices.Our results demonstrate the potential of using quantum computers to aid in the design of advanced quantum processors.

关 键 词：Quantum simulation Quantum computer-aided design Variational quantum algorithm Superconducting qubit ANHARMONICITY 

分 类 号：O413[理学—理论物理] TP38[理学—物理]