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Chin. Phys. B, 2018, Vol. 27(8): 084207    DOI: 10.1088/1674-1056/27/8/084207

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
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.
Keywords:  3D transmon qubit      qubit-qubit coupling      coherent state exchange      Rabi-like oscillation  
Received:  12 March 2018      Revised:  17 April 2018      Accepted manuscript online: 
PACS:  42.50.Ct (Quantum description of interaction of light and matter; related experiments)  
  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)  
Fund: 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).
Corresponding Authors:  Wei Chen     E-mail:

Cite this article: 

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 2018 Chin. Phys. B 27 084207

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