Abstract
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.
Highlights
Often, in solid state physics, the electric resistance of real systems shows fluctuations related to defects that modify the electric properties of the conductors
We study the effects of a source of dichotomous random telegraph noise (RTN) on a long Josephson junction (JJ) (LJJ), excited by both constant and oscillating external driving currents
We studied the effects of a correlated dichotomous noise on the switching dynamics from the superconducting state towards the resistive state of a long overdamped Josephson junction (JJ)
Summary
In solid state physics, the electric resistance of real systems shows fluctuations related to defects that modify the electric properties of the conductors. The effect of non-Gaussian noise on the average escape time from the superconducting metastable state of a current biased JJ, coupled with non-equilibrium current fluctuations, has been experimentally investigated [31,32]. The dynamics of the phase difference of the LJJ, analyzed within the sine-Gordon model [37,38,45,46], is characterized by the formation and propagation of particular wave packets, called solitons [47,48] Their presence is strongly related to the penetration of the magnetic flux quanta, i.e., fluxons [49,50], traveling through the junction during the switching towards the resistive state.
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