Experimental characterization of the two current states in a Nb persistent-current qubit

Author

Segall, Kenneth ; Crankshaw, Donald S. ; Nakada, Daniel ; Singh, Bhuwan ; Lee, Janice ; Orlando, Terry P. ; Berggren, Karl K. ; Markovic, Nina ; Valenzuela, Sergio O. ; Tinkham, Michael

Author_Institution

Massachusetts Inst. of Technol., Cambridge, MA, USA

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

1009

Lastpage

1012

Abstract

We present experiments to characterize a Nb persistent-current qubit as a two-state system. The magnetization signal from the qubit is read-out by a DC-SQUID with near single-shot efficiency. Experiments varying SQUID ramp-rate and temperature suggest thermal activation occurs between the two circulating current states. Such data can be used to fit the parameters of the system, in order to characterize its performance as a potential quantum bit.

Keywords

SQUIDs; niobium; persistent currents; quantum computing; superconducting integrated circuits; DC-SQUID; Nb; circulating current states; current states; magnetization signal; near single-shot efficiency; persistent-current qubit; quantum computers; ramp-rate; thermal activation; two-state system; Circuits; Josephson junctions; Laboratories; Lithography; Magnetic field measurement; Magnetization; Niobium; Quantum computing; SQUIDs; Temperature;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.814126

Filename

1211776