Title :
An unshunted comparator as a device for quantum measurements
Author :
Wulf, Michael ; Zhou, Xingxiang ; Habif, Jonathan L. ; Rott, Pavel ; Bocko, Mark F. ; Feldman, Marc J.
Author_Institution :
Dept. of Phys. & Astron., Univ. of Rochester, NY, USA
fDate :
6/1/2003 12:00:00 AM
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.
Keywords :
comparators (circuits); quantum noise; readout electronics; superconducting device noise; superconducting integrated circuits; Josephson junction; anti-pulse reflection; coherence properties; quantum measurement; quantum noise; qubit readout; superconducting circuit; unshunted SFQ comparator; Current measurement; Extraterrestrial measurements; Foundries; Integrated circuit measurements; Josephson junctions; Magnetic field measurement; Physics; Pulse measurements; SQUIDs; Superconducting device noise;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.814117
