Brian Josephson predicted that weakly coupled superconductors can carry a phase-dependent current. In the ideal Josephson effect, relates the current to the condensates' phase difference, while determines its evolution under a voltage. A constant voltage therefore gives an alternating current with frequency . The relations make a macroscopic quantum phase measurable through electrical behavior and connect superconducting coherence with precision frequency and voltage experiments.[ref]
Possible new effects in superconductive tunnelling by Brian D. Josephson. Physics Letters 1, 251–253 (1962), predicted tunnelling supercurrent and voltage-driven phase evolution
Identity source: www.nobelprize.org/prizes/physics/1973/press-release/
Portrait of Brian Josephson
. Brian Josephson. CC BY 3.0, via Wikimedia Commons. Source.
