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Stabilization effects of dichotomous noise on the lifetime of the superconducting state in a long Josephson junction

  • Authors: Guarcello, C.; Valenti, D.; Carollo, A.; Spagnolo, B.
  • Publication year: 2015
  • Type: Articolo in rivista (Articolo in rivista)
  • Key words: Dichotomous noise; Long Josephson junction; Mean switching time; Metastability; Noise enhanced stability; Nonequilibrium statistical mechanics; Nonlinear relaxation time;
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We investigate the superconducting lifetime of a long overdamped current-biased Josephson junction, in the presence of telegraph noise sources. The analysis is performed by randomly choosing the initial condition for the noise source. However, in order to investigate how the initial value of the dichotomous noise affects the phase dynamics, we extend our analysis using two different fixed initial values for the source of random fluctuations. In our study, the phase dynamics of the Josephson junction is analyzed as a function of the noise signal intensity, for different values of the parameters of the system and external driving currents. We find that the mean lifetime of the superconductive metastable state as a function of the noise intensity is characterized by nonmonotonic behavior, strongly related to the soliton dynamics during the switching towards the resistive state. The role of the correlation time of the noise source is also taken into account. Noise-enhanced stability is observed in the investigated system.