Tuning rf-SQUID flux qubit system's potential with magnetic flux bias |
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| Authors: | Hua Tao Xu Wei-Wei Shi Jian-Xin An De-Yue Sun Guo-Zhu Yu Yang Wu Pei-Heng |
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| Affiliation: | 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 |
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| Abstract: | At an extremely low temperature of 20 mK, we measured loop current in a tunable rf superconducting quantum interference device (SQUID) with a dc-SQUID. By adjusting the magnetic flux applied to the rf-SQUID loop (Φf) and the small dc-SQUID (Φfcjj), respectively, the potential shape of the system can be fully controlled in situ. Variations of transition step and overlap size in switching current with the barrier flux bias are analyzed, from which we can obtain some relevant device parameters and built up a model to explain the experimental phenomenon. |
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| Keywords: | rf-SQUID potential flux qubit |
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