Phenomenological noise model for superconducting qubits: two-state fluctuators and 1=f noise

Details Phenomenological noise model for superconducting qubits: two-state fluctuators and 1=f noise Phenomenological noise model for superconducting qubits: two-state fluctuators and 1=f noise

2011-02-28

arxiv.org/abs/1102.5766v2

Supercond. Sci. Technol. 25 (2012) 045003

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 2 figures, 1 table

Scientific paper

10.1088/0953-2048/25/4/045003

We present a general phenomenological model for superconducting qubits subject to noise produced by two-state fluctuators whose couplings to the qubit are all roughly the same. In flux qubit experiments where the working point can be varied, it is possible to extract both the form of the noise spectrum and the number of fluctuators. We find that the noise has a broad spectrum consistent with 1=f noise and that the number of fluctuators with slow switching rates is surprisingly small: less than 100. If the fluctuators are interpreted as unpaired surface spins, then the size of their magnetic moments is surprisingly large.

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