Reverse switching current distributions in underdamped Josephson junctions

The probability of the reverse switching currents I r from the finite voltage to the Josephson current state are reported. The results are based on a more general analysis recently developed. The work is relevant in the region of current near the deterministic value I r of the reverse current where noise effects are more relevant. The probability distributions are reported for various values of the junction, noise and bias parameters. A comparison with the distributions of the Josephson critical current is also reported in order to discuss some aspects of the switching dynamics of the junction.