Tuning rf-SQUID flux qubit system's potential with magnetic flux bias

doi:10.1088/1674-1056/21/9/098501

Abstract At an extremely low temperature of 20 mK, we measured loop current in a tunable rf superconducting quantum interference device (SQUID) with a dc-SQUID. By adjusting the magnetic flux applied to the rf-SQUID loop (Φ_f) and the small dc-SQUID (Φ_f^cjj), respectively, the potential shape of the system can be fully controlled in situ. Variations of transition step and overlap size in switching current with the barrier flux bias are analyzed, from which we can obtain some relevant device parameters and built up a model to explain the experimental phenomenon.

Keywords: rf-SQUID potential flux qubit

Received: 06 April 2012
Revised: 17 May 2012
Accepted manuscript online:

PACS:	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))
	85.25.Cp	(Josephson devices)
	03.67.Lx	(Quantum computation architectures and implementations)

Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2011CBA00107 and 2011CBA00202) and the National Natural Science Foundation of China (Grant Nos. 61027008 and 11074114).

Corresponding Authors: Xu Wei-Wei
E-mail: wwxu@nju.edu.cn

Cite this article:

Hua Tao (花涛), Xu Wei-Wei (许伟伟), Shi Jian-Xin (史建新), An De-Yue (安德越), Sun Guo-Zhu (孙国柱), Yu Yang (于扬), Wu Pei-Heng (吴培亨) Tuning rf-SQUID flux qubit system's potential with magnetic flux bias 2012 Chin. Phys. B 21 098501

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Tuning rf-SQUID flux qubit system's potential with magnetic flux bias

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