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

Shigeo SATO  Kunihiro INOMATA  Mitsunaga KINJO  Nobuhiro KITABATAKE  Koji NAKAJIMA  Huabing WANG  Takeshi HATANO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.3   pp.599-604
Publication Date: 2007/03/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.3.599
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Innovative Superconducting Devices and Their Applications)
Category: 
Keyword: 
Josephson junction,  macroscopic quantum tunneling,  high-Tc superconductor,  resonant activation,  qubit,  

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Summary: 
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.