A Josephson sampler with 2.1 ps resolution

• Published in: IEEE transactions on magnetics Vol. 21; no. 2; pp. 226 - 229
• Main Authors: Wolf, P., Van Zeghbroeck, B., Deutsch, U.
• Format: Journal Article
• Language: English
• Published: IEEE 01-03-1985
• Subjects: Inductance; Laboratories; Niobium; Oscilloscopes; Propagation delay; Pulse circuits; Pulse generation; Sampling methods; Signal resolution; Voltage
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.1985.1063713

A Josephson sampler with 2.1 ps resolution is reported. The sampler was made with Nb edge junctions, and consists of a sampling junction to which a Faris pulser is coupled directly. Two experiments are connected to the sampler: a two-junction interferometer and another Faris pulser. A new and simple electronic delay allows a flicker-free display on an oscilloscope of the waveform sampled. A current sensitivity of 0.8 μA was achieved. It was possible to measure the switching transitions of the two-junction interferometer over its whole vortex boundary, including vortex-to-vortex transitions which occur at low bias currents. To our knowledge, this is the fastest Josephson sampler made to date.