Quantum Interferometer. Heterodyne Detection with Superconducting Point Contacts and Enhanced Heterodyne Signals from Tightly-Coupled Contacts.
Quarterly technical rept. no. 6, 15 Jan-15 Jun 69,
PHILCO-FORD CORP NEWPORT BEACH CA AERONUTRONIC DIV
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Several modes of operation of point contacts as heterodyne detectors in the frequency range 0 to ten to the plus ten hz were investigated experimentally. A point contact in a superconducting loop, under the application of two externally-generated a-c fields, behaved as expected on the basis of previous work. Likewise, a point contact in a partly-resistive loop, in which an externally-generated signal is heterodyned with the Josephson oscillation of the contact, gave the expected results. On the other hand, an anomalously large heterodyne signal was obtained from a pair of closely-coupled Josephson-oscillating contacts. No explanation of this result is offered, but it appears that a sort of amplification of the heterodyne signal is effected when the Josephson frequencies are larger than the heterodyne frequency. Author
- Electrical and Electronic Equipment
- Solid State Physics
- Electromagnetic Pulses