| macroscopic quantum effect in which, when a direct current (DC) voltage U is applied across a Josephson junction, an alternating current of Cooper pairs flows by tunnel effect through the junction, generating the emission of photons having a frequency f proportional to the applied voltage and satisfying the relation: where h is the Planck constant and e is the elementary electric charge
Note 1 to entry: The AC Josephson effect also manifests itself conversely so that, when a Josephson junction is irradiated by an electromagnetic radiation of frequency f, the voltage across it can assume quantized values equal to , where n is a positive integer. Note 2 to entry: f/U =483 597,848 416 984 Hz V-1. Note 3 to entry: This entry was numbered 815-10-39 in IEC 60050-815:2015.
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