An unshunted comparator as a device for quantum measurements

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...

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Veröffentlicht in:	IEEE transactions on applied superconductivity 2003-06, Vol.13 (2), p.974-977
Hauptverfasser:	Wulf, M., Xingxiang Zhou, Habif, J.L., Rott, P., Bocko, M.F., Feldman, M.J.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Circuit properties Classical and quantum physics: mechanics and fields Current measurement Digital circuits Electric, optical and optoelectronic circuits Electronic circuits Electronics Exact sciences and technology Extraterrestrial measurements Foundries Instruments, apparatus, components and techniques common to several branches of physics and astronomy Integrated circuit measurements Josephson junctions Magnetic components, instruments and techniques Magnetic field measurement Magnetometers for magnetic field measurements Physics Pulse measurements Quantum information Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices SQUIDs Superconducting device noise Superconducting devices
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Beschreibung
Zusammenfassung:	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.
ISSN:	1051-8223 1558-2515
DOI:	10.1109/TASC.2003.814117