Low- and high-frequency noise from coherent two-level systems

Details Low- and high-frequency noise from coherent two-level systems Low- and high-frequency noise from coherent two-level systems

2004-12-23

arxiv.org/abs/cond-mat/0412668v2

Phys. Rev. Lett. 94, 127002 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

minor corrections, references added

Scientific paper

10.1103/PhysRevLett.94.127002

Recent experiments indicate a connection between the low- and high-frequency noise affecting superconducting quantum systems. We explore the possibilities that both noises can be produced by one ensemble of microscopic modes, made up, e.g., by sufficiently coherent two-level systems (TLS). This implies a relation between the noise power in different frequency domains, which depends on the distribution of the parameters of the TLSs. We show that a distribution, natural for tunneling TLSs, with a log-uniform distribution in the tunnel splitting and linear distribution in the bias, accounts for experimental observations.

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