Cavity syncronisation of underdamped Josephson junction arrays

P. Barbara, G. Filatrella, C. Lobb, Niels Falsig Pedersen

Research output: Contribution to journalJournal articleResearchpeer-review


Our recent experiments show that arrays of underdamped Josephson junctions radiate coherently only above a threshold number of junctions switched onto the radiating state. For each junction, the radiating state is a resonant step in the current-voltage characteristics due to the interaction between the junctions in the array and an electromagnetic cavity. Here we show that a model of a one-dimensional array of Josephson junctions coupled to a resonator can produce many features of the coherent be havior above threshold, including coherent radiation of power and the shape of the array current-voltage characteristic. The model also makes quantitative predictions about the degree of coherence of the junctions in the array. However, in this model there is no threshold; the experimental below-threshold region behavior could not be reproduced.
Original languageEnglish
JournalThe European Physical Journal B
Issue number1
Pages (from-to)3-8
Publication statusPublished - 2003

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