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Probing Noise in Flux Qubits via Macroscopic Resonant Tunneling

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arxiv 0712.0838 v2 pith:RRE7ZVIA submitted 2007-12-06 cond-mat.mes-hall cond-mat.supr-con

R. Harris , M.W. Johnson , S. Han , A.J. Berkley , J. Johansson , P. Bunyk , E. Ladizinsky , S. Govorkov
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M.C. Thom S. Uchaikin B. Bumble A. Fung A. Kaul A. Kleinsasser M.H.S. Amin D.V. Averin
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classification cond-mat.mes-hallcond-mat.supr-con
keywords fluxnoisebiasmacroscopicrateresonanttunnelingwell
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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 r.m.s. amplitude of the noise, which is proportional to the decoherence rate 1/T_2^*, was observed to be weakly dependent on temperature below 70 mK. Analysis of these results indicates that the dominant source of low frequency (1/f) flux noise in this device is a quantum mechanical environment in thermal equilibrium.

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