Title :
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
fDate :
6/1/2003 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.814126
