Macroscopic resonant tunneling in an rf-SQUID flux qubit under a single-cycle sinusoidal driving

doi:10.1088/1674-1056/26/4/047402

Abstract

We experimentally demonstrate the observation of macroscopic resonant tunneling (MRT) phenomenon of the macroscopic distinct flux states in a radio frequency superconducting quantum interference device (rf-SQUID) under a single-cycle sinusoidal driving. The population of the qubit exhibits interference patterns corresponding to resonant tunneling peaks between states in the adjacent potential wells. The dynamics of the qubit depends significantly on the amplitude, frequency, and initial phase of the driving signal. We do the numerical simulations considering the intra-well and inter-well relaxation mechanism, which agree well with the experimental results. This approach provides an effective way to manipulate the qubit population by adjusting the parameters of the external driving field.

Keywords: superconducting quantum interference device (SQUID) macroscopic resonant tunneling (MRT) Landau-Zener transition

Received: 31 October 2016
Revised: 18 January 2017
Accepted manuscript online:

PACS:	74.40.Kb	(Quantum critical phenomena)
	74.50.+r	(Tunneling phenomena; Josephson effects)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11474154, 61371036, 61571219, 11227904, and 61501222) and the Natural Science Fund for Distinguished Young Scholars of Jiangsu Province, China (Grant No. BK2012013) and PAPD.

Corresponding Authors: Weiwei Xu, Guozhu Sun
E-mail: wwxu@nju.edu.cn;gzsun@nju.edu.cn

Cite this article:

Jianxin Shi(史建新), Weiwei Xu(许伟伟), Guozhu Sun(孙国柱), Jian Chen(陈健), Lin Kang(康琳), Peiheng Wu(吴培亨) Macroscopic resonant tunneling in an rf-SQUID flux qubit under a single-cycle sinusoidal driving 2017 Chin. Phys. B 26 047402

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Macroscopic resonant tunneling in an rf-SQUID flux qubit under a single-cycle sinusoidal driving

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