Macroscopic resonant tunneling in an rf-SQUID flux qubit  

作　　者：丛山桦 王轶文 孙国柱 陈健 于扬 吴培亨 

机构地区：[1]Research Institute of Superconductor Electronics,School of Electronic Science and Engineering,Nanjing University [2]National Laboratory of Solid State Microstructures,School of Physics,Nanjing University

出　　处：《Chinese Physics B》2011年第5期130-133,共4页中国物理B（英文版）

基　　金：Project supported by the New Century Excellent Talents in University,China;the National Natural Science Foundation of China(Grant Nos. 11074114 and 10874074);the National Basic Research Program of China (Grant No. 2011CBA00200)

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.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 

分 类 号：O469[理学—凝聚态物理]