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Macroscopic resonant tunneling in an rf-SQUID flux qubit |
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| Authors: | Cong Shan-Hu Wang Yi-Wen Sun Guo-Zhu Chen Jian Yu Yang Wu Pei-Heng |
| Affiliation: | Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China; National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China |
| 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. |
| Keywords: | rf-SQUID macroscopic resonant tunneling quantum noise flux qubit |
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