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IEICE Transactions on Electronics 2007 E90-C(3):599-604; doi:10.1093/ietele/e90-c.3.599
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Copyright © 2007 The Institute of Electronics, Information and Communication Engineers

Special Section on Innovative Superconducting Devices and Their Applications -- Papers

Macroscopic Quantum Tunneling and Resonant Activation of Current Biased Intrinsic Josephson Junctions in Bi-2212

Shigeo SATO1, Kunihiro INOMATA2, Mitsunaga KINJO3, Nobuhiro KITABATAKE1, Koji NAKAJIMA1, Huabing WANG4 and Takeshi HATANO4

1 The authors are with the Research Institute of Electrical Communication, Tohoku University, Sendai-shi, 980-8577 Japan. E-mail: shigeo{at}riec.tohoku.ac.jp, 2 The author is with the Frontier Research System, RIKEN, Tsukuba-shi, 305-0841 Japan., 3 The author is with the Department of Electrical and Electronic Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa-ken, 903-0213 Japan., 4 The authors are with the Nano System Functionality Center, National Institute for Materials Science, Tsukuba-shi, 305-0047 Japan.


  Abstract

The utilization of a high-Tc superconductor for implementing a superconducting qubit is to be expected. Recent researches on the quantum property of Josephson junctions in high-Tc superconductors indicate that the low energy quasiparticle excitation is weak enough to observe the macroscopic quantum tunneling. Therefore, a detailed study on the quantum property of high-Tc Josephson junctions becomes more important for applications. We show our experimental results of the macroscopic tunneling of current biased intrinsic Josephson junctions in Bi-2212 and its resonant activation in the presence of microwave radiation.

Key Words: Josephson junction, macroscopic quantum tunneling, high-Tc superconductor, resonant activation, qubit

Manuscript received July 12, 2006.


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