Spectroscopy and coherent manipulation of single and coupled flux qubits

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

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.

Keywords: quantum computing flux qubit Rabi oscillation dc-SQUID

Received: 26 March 2013
Revised: 19 April 2013
Accepted manuscript online:

PACS:	03.67.Lx	(Quantum computation architectures and implementations)
	85.25.Cp	(Josephson devices)
	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))
	85.25.Hv	(Superconducting logic elements and memory devices; microelectronic circuits)

Fund: 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.

Corresponding Authors: Zheng Dong-Ning
E-mail: dzheng@aphy.iphy.ac.cn

Cite this article:

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 2013 Chin. Phys. B 22 090312

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Spectroscopy and coherent manipulation of single and coupled flux qubits

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