Measurements of 1/ f noise in Josephson junctions at zero voltage: Implications for decoherence in superconducting quantum bits
Superconductivity
2007-05-23 v1 Mesoscale and Nanoscale Physics
Abstract
Critical current fluctuations with a 1/ f spectral density (f is frequency) are potentially a limiting source of intrinsic decoherence in superconducting quantum bits (qubits) based on Josephson tunnel junctions. Prior measurements of this noise were made at nonzero voltages whereas qubits are operated in the zero voltage state. We report measurements of 1/ f noise in a dc superconducting quantum interference device first, coupled to a resonant tank circuit and operated in a dispersive mode at zero voltage, and, second, operated conventionally with a current bias in the voltage regime. Both measurements yield essentially the same magnitude of critical current 1/ f noise.
Cite
@article{arxiv.cond-mat/0501153,
title = {Measurements of 1/ f noise in Josephson junctions at zero voltage: Implications for decoherence in superconducting quantum bits},
author = {Michael Mueck and Matthias Korn and C. G. A. Mugford and J. B. Kycia and John Clarke},
journal= {arXiv preprint arXiv:cond-mat/0501153},
year = {2007}
}
Comments
3 pages, 2 figures