Probing Noise in Flux Qubits via Macroscopic Resonant Tunneling

Details Probing Noise in Flux Qubits via Macroscopic Resonant Tunneling Probing Noise in Flux Qubits via Macroscopic Resonant Tunneling

2007-12-06

arxiv.org/abs/0712.0838v2

Phys. Rev. Lett. 101, 117003 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages 4 figures

Scientific paper

10.1103/PhysRevLett.101.117003

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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