Abstract

The unshunted single-flux-quantum SFQ comparator is described for the first time. Its dynamic behavior is surprisingly similar to the familiar resistively-shunted SFQ comparator. For certain parameter ranges both junctions of the comparator may pulse at the same time to create a reflected anti-pulse. This phenomenon is utilized in a new SFQ comparator design with better coherence properties for qubit readout. Considerations of quantum noise for the unshunted SFQ comparator are discussed.

Date

January 1, 1970

Authors

Michael Wulf, Xingxiang Zhou, Jonathan L Habif, Pavel Rott, Mark F Bocko, Marc J Feldman

Journal

IEEE transactions on applied superconductivity

Volume

13

Issue

2

Pages

974-977

Publisher

IEEE