Abstract
Computer simulations of the fluctuational dynamics of a long-overlap Josephson junction in the frame of the sine-Gordon model with a white noise source have been performed. It has been demonstrated that for the case of constant critical current density the mean escape time (MET) increases with increasing junction length; and for homogeneous bias current distribution the MET tends to a constant, while for inhomogeneous current distribution the MET quickly decreases after approaching a few Josephson lengths. The mean voltage (measured in the noise-induced regime where the phase consequently jumps between neighboring potential minima) versus junction length behaves inversely in comparison with the MET.
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