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Low- and high-frequency noise from coherent two-level systems -: art. no. 127002

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PHYSICAL REVIEW LETTERS
卷 94, 期 12, 页码 -

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AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.94.127002

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Recent experiments indicate a connection between the low- and high-frequency noises 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's). This implies a relation between the noise power in different frequency domains, which depends on the distribution of the parameters of the TLS's. We show that a distribution, natural for tunneling TLS's, with a log-uniform distribution in the tunnel splitting and linear distribution in the bias, accounts for experimental observations.

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