Probing noise in flux qubits via macroscopic resonant tunneling.
Phys Rev Lett
; 101(11): 117003, 2008 Sep 12.
Article
em En
| MEDLINE
| ID: mdl-18851318
ABSTRACT
Macroscopic resonant tunneling between the two lowest lying states of a bistable rf SQUID is used to characterize noise in a flux qubit. Measurements of the incoherent decay rate as a function of flux bias revealed a Gaussian-shaped profile that is not peaked at the resonance point but is shifted to a bias at which the initial well is higher than the target well. The rms amplitude of the noise, which is proportional to the dephasing rate 1/tauphi, was observed to be weakly dependent on temperature below 70 mK. Analysis of these results indicates that the dominant source of low energy flux noise in this device is a quantum mechanical environment in thermal equilibrium.
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Canadá