Construction of two-qubit logical gates by transmon qubits in a three-dimensional cavity

doi:10.1088/1674-1056/27/8/084207

中国物理B ›› 2018, Vol. 27 ›› Issue (8): 84207-084207.doi: 10.1088/1674-1056/27/8/084207

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Construction of two-qubit logical gates by transmon qubits in a three-dimensional cavity

Han Cai(蔡涵), Qi-Chun Liu(刘其春), Chang-Hao Zhao(赵昌昊), Ying-Shan Zhang(张颖珊), Jian-She Liu(刘建设), Wei Chen(陈炜)

Tsinghua National Laboratory for Information Science and Technology, Department of Microelectronics and Nanoelectronics, Institute of Microelectronics, Tsinghua University, Beijing, China

收稿日期:2018-03-12 修回日期:2018-04-17 出版日期:2018-08-05 发布日期:2018-08-05
通讯作者: Wei Chen E-mail:weichen@tsinghua.edu.cn
基金资助:
Project supported by the National Basic Research and Development Program of China (Grant No. 2011CBA00304), the National Natural Science Foundation of China (Grant Nos. 60836001 and 61174084), and the Tsinghua University Initiative Scientific Research Program, China (Grant No. 20131089314).

Construction of two-qubit logical gates by transmon qubits in a three-dimensional cavity

Han Cai(蔡涵), Qi-Chun Liu(刘其春), Chang-Hao Zhao(赵昌昊), Ying-Shan Zhang(张颖珊), Jian-She Liu(刘建设), Wei Chen(陈炜)

Tsinghua National Laboratory for Information Science and Technology, Department of Microelectronics and Nanoelectronics, Institute of Microelectronics, Tsinghua University, Beijing, China

Received:2018-03-12 Revised:2018-04-17 Online:2018-08-05 Published:2018-08-05
Contact: Wei Chen E-mail:weichen@tsinghua.edu.cn
Supported by:
Project supported by the National Basic Research and Development Program of China (Grant No. 2011CBA00304), the National Natural Science Foundation of China (Grant Nos. 60836001 and 61174084), and the Tsinghua University Initiative Scientific Research Program, China (Grant No. 20131089314).

摘要/Abstract

摘要： We report the implementation of qubit-qubit coupling in a three-dimensional (3D) cavity, using the exchange of virtual photons, to realize logical operations. We measure single photon and multi-photon transitions in this qubit-qubit coupling system and obtain its energy avoided-crossing spectrum. With ac-Stark effect, fast control of the qubits is achieved to tune the effective coupling on and off and the state-swap gate √SWAP is successfully constructed. Moreover, using two-photon transition between the ground state and doubly excited states, a kind of two-photon Rabi-like oscillation is observed. A quarter period of this oscillation corresponds to the logical gate √bSWAPP, which is used for generating Bell states. √bSWAPP and √iSWAP are the foundations of future preparation of two-qubit Bell states and realization of CNOT gate.

关键词: 3D transmon qubit, qubit-qubit coupling, coherent state exchange, Rabi-like oscillation

Abstract: We report the implementation of qubit-qubit coupling in a three-dimensional (3D) cavity, using the exchange of virtual photons, to realize logical operations. We measure single photon and multi-photon transitions in this qubit-qubit coupling system and obtain its energy avoided-crossing spectrum. With ac-Stark effect, fast control of the qubits is achieved to tune the effective coupling on and off and the state-swap gate √SWAP is successfully constructed. Moreover, using two-photon transition between the ground state and doubly excited states, a kind of two-photon Rabi-like oscillation is observed. A quarter period of this oscillation corresponds to the logical gate √bSWAPP, which is used for generating Bell states. √bSWAPP and √iSWAP are the foundations of future preparation of two-qubit Bell states and realization of CNOT gate.

Key words: 3D transmon qubit, qubit-qubit coupling, coherent state exchange, Rabi-like oscillation

中图分类号: (Quantum description of interaction of light and matter; related experiments)

42.50.Ct

03.67.Lx (Quantum computation architectures and implementations) 74.78.Na (Mesoscopic and nanoscale systems) 85.25.Hv (Superconducting logic elements and memory devices; microelectronic circuits)

蔡涵, 刘其春, 赵昌昊, 张颖珊, 刘建设, 陈炜. Construction of two-qubit logical gates by transmon qubits in a three-dimensional cavity[J]. 中国物理B, 2018, 27(8): 84207-084207.

Han Cai(蔡涵), Qi-Chun Liu(刘其春), Chang-Hao Zhao(赵昌昊), Ying-Shan Zhang(张颖珊), Jian-She Liu(刘建设), Wei Chen(陈炜). Construction of two-qubit logical gates by transmon qubits in a three-dimensional cavity[J]. Chin. Phys. B, 2018, 27(8): 84207-084207.

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Construction of two-qubit logical gates by transmon qubits in a three-dimensional cavity

Construction of two-qubit logical gates by transmon qubits in a three-dimensional cavity

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