Direct measurements of relaxation time scales in Josephson junctions

Year: 1996

Authors: Fabeni P., Linari R., Mugnai D., Nikl M., Pazzi G.P., Ranfagni A., Salvini L., Cristiano R., Frunzio L., Lanzi L., Ventura G., Cetica M., Schulman LS..

Autors Affiliation: Istituto di Ricerca sulle Onde Elettromagnetiche “Nello Carrara” – CNR, 50127 Firenze, Italy;
Istituto di Cibernetica -CNR, Napoli Italy;
Dipartimento di Fisica, Università di Firenze, Firenze, Italy;
Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy;
Clarkson University, Department of Physics, Potsdam, NY, USA

Abstract: We describe an experimental method for obtaining a direct measurement of the lifetime tau(d) of the zero-voltage state in Josephson junctions operating at temperatures around 1 K (thermal regime). The range of tau(d) covered by this method runs typically from 10(-3) to 10(-6) sec. The comparison of the experimental results with the theoretical predictions is also a test of the effective temperature of the junction. The possibility of extending the procedure for the determination of other time-scales, such as those involved in quantum-Zeno effect and traversal time, are discussed.

Journal/Review: SOLID STATE COMMUNICATIONS

Volume: 97 (6)      Pages from: 439  to: 444

More Information: This researchw asm adei n the frameworko f a CNR coordinatepdr ojectd evotedto the de-tectiono f MQT. The partialf inanciMs upport of the Center for TechnologicaDl evelopment (CESVIT) of Provinciad i Firenzei s gratefully acknowledged. One of the authors (M.N.) undertookth is work with the supporto f the ICTP Programmefo r Training and Research in Italian Laboratories.T his work was sup-portedi n part by the United StatesN ational ScienceF oundationg rantPHY 93 16681.
KeyWords: superconductors; tunneling
DOI: 10.1016/0038-1098(95)00704-0

Citations: 8
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