TITLE

Measurements of 1/f noise in Josephson junctions at zero voltage: Implications for decoherence in superconducting quantum bits

AUTHOR(S)
Mück, Michael; Korn, Matthias; Mugford, C. G. A.; Kycia, J. B.; Clarke, John
PUB. DATE
January 2005
SOURCE
Applied Physics Letters;1/3/2005, Vol. 86 Issue 1, p012510
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
15593139

 

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