Macroscopic quantum effects in Josephson systems

Author

Corato, Valentina ; Esposito, Emanuela ; Granata, Carmine ; Monaco, Antonia ; Ruggiero, Berardo ; Russo, Maurizio ; Stodolsky, Leo ; Silvestrini, Paolo

Author_Institution

Ist. di Cibernetica, CNR, Arco Felice, Italy

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

994

Lastpage

997

Abstract

Macroscopic quantum effects in Josephson systems have attracted great interest in the scientific community both for the physics involved and in view of applications. We present data on macroscopic quantum tunneling on Josephson junctions. Actually the most fascinating topic is the observation of macroscopic quantum coherence in rf-SQUID. This effect also has implications for quantum computing, because a quantum two-state system represents a single quantum bit, which is the elementary unit of a quantum computer. In this context, here we present a new method to measure quantum coherence between different fluxoid states of an rf-SQUID by using the procedure of “adiabatic inversion”. This method offers the possibility of measuring tunneling and decoherence times in the system

Keywords

Josephson effect; SQUIDs; superconductive tunnelling; Josephson junction; RF SQUID; adiabatic inversion; decoherence time; fluxoid state; macroscopic quantum coherence; macroscopic quantum tunneling; quantum computing; tunneling time; Biomedical measurements; Energy states; Friction; Josephson junctions; Physics; Plasma temperature; Quantum computing; Quantum mechanics; Telephony; Tunneling;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919516

Filename

919516