Measurement accuracy of macroscopic quantum circuits with RF-biased Josephson junction arrays

Conference · Tue Jun 25 04:00:00 EDT 1991 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/0953-2048/4/9/008· OSTI ID:5807331

Dunlap, D. H. ^[1]; Duncan, R. V. ^[1]

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1. New Mexico University, Albuquerque, NM (United States)

The DC voltage output from a hysteretic Josephson junction which is locked to an AC frequency source differs from the ideal Josephson relation if the junction drives a current about a closed superconducting circuit. The difference in voltage Delta V from two hysteretic Josephson junctions driven in series opposition is proportional to the difference in their driving frequencies Delta omega if the junctions are each biased to the nth voltage step. It is shown here, however, that Delta V is systematically smaller than the voltage difference Delta V₀ predicted by the ideal Josephson relation Delta V₀=(nh(cross)/2e) Delta omega . If the loop inductance approaches zero, the smallest detectable voltage difference Delta V₀ between two junctions is limited by the intrinsic Josephson inductance. For arrays of more than one junction, however, Delta V₀ remains proportional to the loop inductance.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5807331
• Report Number(s): SAND--91-0954C; CONF-910623--1; ON: DE91012651
• Conference Information: Journal Name: Superconductor Science and Technology Journal Issue: 9 Journal Volume: 4
• Country of Publication: United States
• Language: English

Related Subjects

426001* -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
INDUCTION
JOSEPHSON JUNCTIONS
JUNCTIONS
MATHEMATICAL MODELS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTING WIRES
VOLTAGE DROP
WIRES