Low and HighFrequency Noise from Coherent TwoLevel Systems
Abstract
Recent experiments indicate a connection between the low and highfrequency 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 twolevel 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 loguniform distribution in the tunnel splitting and linear distribution in the bias, accounts for experimental observations.
 Publication:

Physical Review Letters
 Pub Date:
 April 2005
 DOI:
 10.1103/PhysRevLett.94.127002
 arXiv:
 arXiv:condmat/0412668
 Bibcode:
 2005PhRvL..94l7002S
 Keywords:

 74.40.+k;
 03.65.Yz;
 03.67.a;
 85.25.j;
 Fluctuations;
 Decoherence;
 open systems;
 quantum statistical methods;
 Quantum information;
 Superconducting devices;
 Mesoscopic Systems and Quantum Hall Effect
 EPrint:
 minor corrections, references added