Measurement accuracy of macroscopic quantum circuits with rf-biased Josephson junction arrays
- New Mexico Univ., Albuquerque, NM (USA). Dept. of Physics and Astronomy
- Sandia National Labs., Albuquerque, NM (USA) New Mexico Univ., Albuquerque, NM (USA). Dept. of Physics and Astronomy
The dc voltage output from an 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}V{sub 0} predicted by the ideal Josephson relation {Delta}V{sub 0} = (n{h bar}/2e){Delta}{omega}. If the loop inductance approaches zero, the smallest detectable voltage difference {Delta}V{sub 0} between two junctions is limited by the intrinsic Josephson inductance. For arrays of more than one junction, however, {Delta}V{sub 0} remains proportional to the loop inductance. 13 refs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5807331
- Report Number(s):
- SAND-91-0954C; CONF-910623-1; ON: DE91012651
- Resource Relation:
- Conference: International superconductive electronics conference (ISEC '91), Glasgow (UK), 25-27 Jun 1991
- Country of Publication:
- United States
- Language:
- English
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