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Springer series in materials science

Quantum Superconducting Networks: From Josephson to QED Arrays

Rosario Fazio

Published Jan 1, 2019• 1 citation
Publisher
DOI
10.1007/978-3-030-20726-7_18

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Superconducting Josephson junction arrays (JJAs) are prototypical systems consisting of an array of superconducting islands connected by small Josephson junctions which provide an explicit realization of the canonical XY model of condensed matter physics.In this study we show how circuit quantumelectrodynamics (QED) techniques, perfected for implementing high-quality quantum bits, enable the exploration of new high-frequency regimes of JJAs.By making use of extremely low excitation power and heating of the array, we can probe physics of these systems using one single photon on average.
We investigate the properties of Josephson junction networks with inhomogeneous architecture. The networks are shaped as quare comb planar lattices on which Josephson junctions link superconducting islands arranged in the plane to generate the pertinent topology. Compared to the behavior of reference linear arrays, the temperature dependencies of the Josephson currents of the branches of the network exhibit relevant differences. The observed phenomena evidence new and surprising behavior of superconducting Josephson arrays as well as remarkable similarities with bosonic junction arrays.