Delayed pulses from high-transparency Josephson junctions

Calculations of the shape and the timing of single-magnetic-flux quanta (SF Qs) generated by high-current-density "self-shunted" Josephson junctions ar e presented. The junction current is assumed to be due in part to multiple Andreev reflections within the high-transparency barrier. The SFQ pulses fr om these junctions show several differences when compared to those from low er-current-density resistively shunted Josephson junctions, the most import ant being that the pulses are significantly delayed in the self-shunted jun ctions, by as much as many times the pulse width. (C) 2001 American Institu te of Physics.