Limits to the fundamental measurement accuracy in Josephson junction array voltage intercomparisons
- Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States)
- Sandia National Laboratories, Albuquerque, New Mexico 87185 (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}{ital 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 {ital n}th voltage step. It is shown here, however, that {Delta}{ital V} is systematically smaller than the voltage difference {Delta}{ital V}{sub 0} predicted by the ideal junction relation {Delta}{ital V}{sub 0}=({ital n}{h bar}/2{ital e}){Delta}{omega}. If the loop inductance approaches zero, the smallest detectable voltage difference {Delta}{ital V}{sub 0} between two junctions is limited by the intrinsic Josephson inductance. For arrays of more than one junction, however, {Delta}{ital V}{sub 0} remains proportional to the loop inductance.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 7285544
- Journal Information:
- Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 71:12; ISSN 0021-8979; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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