A Direct Coupled Josephson Sampler

Abstract
A direct coupled Josephson sampler with a single junction as a sampling gate which is directly connected with a sampler pulser and unknown signal sources by resistors is reported. Devices are fabricated by a Pb-alloy technology with a minimum size of 2.5×2.5 µm2 and a current density of 4 kA/cm2 for junctions. The sampler reconstructs a latching waveform with a 10 ps rise time from an interferometer within a few µA current sensitivity.