Macroscopic resonant tunneling in an rf-SQUID flux qubit

doi:10.1088/1674-1056/20/5/050316

中国物理B ›› 2011, Vol. 20 ›› Issue (5): 50316-050316.doi: 10.1088/1674-1056/20/5/050316

Macroscopic resonant tunneling in an rf-SQUID flux qubit

王轶文¹, 于扬¹, 丛山桦², 孙国柱², 陈健², 吴培亨²

(1)National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China; (2)Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China

收稿日期:2010-10-08 修回日期:2010-12-10 出版日期:2011-05-15 发布日期:2011-05-15
基金资助:
Project supported by the New Century Excellent Talents in University, China, the National Natural Science Foundation of China (Grant Nos. 11074114 and 10874074), and the National Basic Research Program of China (Grant No. 2011CBA00200).

Macroscopic resonant tunneling in an rf-SQUID flux qubit

Cong Shan-Hua (丛山桦)^a, Wang Yi-Wen (王轶文)^b, Sun Guo-Zhu (孙国柱)^a, Chen Jian (陈健)^a, Yu Yang (于扬)^b, Wu Pei-Heng (吴培亨)^a

^a Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China; ^b National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China

Received:2010-10-08 Revised:2010-12-10 Online:2011-05-15 Published:2011-05-15
Supported by:
Project supported by the New Century Excellent Talents in University, China, the National Natural Science Foundation of China (Grant Nos. 11074114 and 10874074), and the National Basic Research Program of China (Grant No. 2011CBA00200).

摘要/Abstract

摘要： We have observed the macroscopic resonant tunneling of magnetic flux between macroscopically distinct quantum states in a superconducting flux qubit. The dependences of the macroscopic resonant tunneling on the barrier height of the potential well, the flux bias and the initial state are investigated. Detailed measurements of the tunneling rate as a function of the flux bias reveal the feature of the quantum noise in the superconducting flux qubit.

关键词: rf-SQUID, macroscopic resonant tunneling, quantum noise, flux qubit

Abstract: We have observed the macroscopic resonant tunneling of magnetic flux between macroscopically distinct quantum states in a superconducting flux qubit. The dependences of the macroscopic resonant tunneling on the barrier height of the potential well, the flux bias and the initial state are investigated. Detailed measurements of the tunneling rate as a function of the flux bias reveal the feature of the quantum noise in the superconducting flux qubit.

Key words: rf-SQUID, macroscopic resonant tunneling, quantum noise, flux qubit

中图分类号: (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)

03.75.Lm

85.25.Dq (Superconducting quantum interference devices (SQUIDs)) 03.67.Lx (Quantum computation architectures and implementations) 42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)

丛山桦, 王轶文, 孙国柱, 陈健, 于扬, 吴培亨. Macroscopic resonant tunneling in an rf-SQUID flux qubit[J]. 中国物理B, 2011, 20(5): 50316-050316.

Cong Shan-Hua (丛山桦), Wang Yi-Wen (王轶文), Sun Guo-Zhu (孙国柱), Chen Jian (陈健), Yu Yang (于扬), Wu Pei-Heng (吴培亨). Macroscopic resonant tunneling in an rf-SQUID flux qubit[J]. Chin. Phys. B, 2011, 20(5): 50316-050316.

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Macroscopic resonant tunneling in an rf-SQUID flux qubit

Macroscopic resonant tunneling in an rf-SQUID flux qubit

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