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Macroscopic resonant tunneling in an rf-SQUID flux qubit

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【作者】 丛山桦； 王轶文； 孙国柱； 陈健； 于扬； 吴培亨；

【Author】 Cong Shan-Hua a),Wang Yi-Wen b),Sun Guo-Zhu a),Chen Jian a),Yu Yang b),and Wu Pei-Heng 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

【机构】 Research Institute of Superconductor Electronics,School of Electronic Science and Engineering,Nanjing University； National Laboratory of Solid State Microstructures,School of Physics,Nanjing University；

【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.

【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.

【关键词】 rf-SQUID； macroscopic resonant tunneling； quantum noise； flux qubit；
【Key words】 rf-SQUID； macroscopic resonant tunneling； quantum noise； flux qubit；
【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)
  • 【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2011年05期
  • 【分类号】O469
  • 【被引频次】1
  • 【下载频次】37
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