Spectroscopy and coherent manipulation of single and coupled flux qubits

doi:10.1088/1674-1056/22/9/090312

中国物理B ›› 2013, Vol. 22 ›› Issue (9): 90312-090312.doi: 10.1088/1674-1056/22/9/090312

Spectroscopy and coherent manipulation of single and coupled flux qubits

吴玉林, 邓辉, 黄克强, 田野, 于海峰, 薛光明, 金贻荣, 李洁, 赵士平, 郑东宁

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2013-03-26 修回日期:2013-04-19 出版日期:2013-07-26 发布日期:2013-07-26
基金资助:
Project supported by the National Basic Research Program of China (Grant Nos. 2011CBA00106 and 2009CB929102), the National Natural Science Foundation of China (Grant Nos. 11104333, 10974243, 11104340, and 11161130519), and the Knowledge Innovation Program of the Chinese Academy of Sciences.

Spectroscopy and coherent manipulation of single and coupled flux qubits

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2013-03-26 Revised:2013-04-19 Online:2013-07-26 Published:2013-07-26
Contact: Zheng Dong-Ning E-mail:dzheng@aphy.iphy.ac.cn
Supported by:
Project supported by the National Basic Research Program of China (Grant Nos. 2011CBA00106 and 2009CB929102), the National Natural Science Foundation of China (Grant Nos. 11104333, 10974243, 11104340, and 11161130519), and the Knowledge Innovation Program of the Chinese Academy of Sciences.

摘要/Abstract

摘要： Measurements of three-junction flux qubits, both single flux qubits and coupled flux qubits, using a coupled direct current superconducting quantum interference device (dc-SQUID) for readout are reported. The measurement procedure is described in detail. We performed spectroscopy measurements and coherent manipulations of the qubit states on a single flux qubit, demonstrating quantum energy levels and Rabi oscillations, with Rabi oscillation decay time T_Rabi=78 ns and energy relaxation time T₁=315 ns. We found that the value of T_Rabi depends strongly on the mutual inductance between the qubit and the magnetic coil. We also performed spectroscopy measurements on inductively coupled flux qubits.

关键词: quantum computing, flux qubit, Rabi oscillation, dc-SQUID

Abstract: Measurements of three-junction flux qubits, both single flux qubits and coupled flux qubits, using a coupled direct current superconducting quantum interference device (dc-SQUID) for readout are reported. The measurement procedure is described in detail. We performed spectroscopy measurements and coherent manipulations of the qubit states on a single flux qubit, demonstrating quantum energy levels and Rabi oscillations, with Rabi oscillation decay time T_Rabi=78 ns and energy relaxation time T₁=315 ns. We found that the value of T_Rabi depends strongly on the mutual inductance between the qubit and the magnetic coil. We also performed spectroscopy measurements on inductively coupled flux qubits.

Key words: quantum computing, flux qubit, Rabi oscillation, dc-SQUID

中图分类号: (Quantum computation architectures and implementations)

03.67.Lx

85.25.Cp (Josephson devices) 85.25.Dq (Superconducting quantum interference devices (SQUIDs)) 85.25.Hv (Superconducting logic elements and memory devices; microelectronic circuits)

吴玉林, 邓辉, 黄克强, 田野, 于海峰, 薛光明, 金贻荣, 李洁, 赵士平, 郑东宁. Spectroscopy and coherent manipulation of single and coupled flux qubits[J]. 中国物理B, 2013, 22(9): 90312-090312.

Wu Yu-Lin (吴玉林), Deng Hui (邓辉), Huang Ke-Qiang (黄克强), Tian Ye (田野), Yu Hai-Feng (于海峰), Xue Guang-Ming (薛光明), Jin Yi-Rong (金贻荣), Li Jie (李洁), Zhao Shi-Ping (赵士平), Zheng Dong-Ning (郑东宁). Spectroscopy and coherent manipulation of single and coupled flux qubits[J]. Chin. Phys. B, 2013, 22(9): 90312-090312.

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Spectroscopy and coherent manipulation of single and coupled flux qubits

Spectroscopy and coherent manipulation of single and coupled flux qubits

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