Observation of the Crossover from Photon Ordering to Delocalization in Tunably Coupled Resonators

Michele C. Collodo, Anton Potočnik, Simone Gasparinetti, Jean Claude Besse, Marek Pechal, Mahdi Sameti, Michael J. Hartmann, Andreas Wallraff, Christopher Eichler

Research output: Contribution to journalArticle

10 Citations (Scopus)
15 Downloads (Pure)

Abstract

Networks of nonlinear resonators offer intriguing perspectives as quantum simulators for nonequilibrium many-body phases of driven-dissipative systems. Here, we employ photon correlation measurements to study the radiation fields emitted from a system of two superconducting resonators in a driven-dissipative regime, coupled nonlinearly by a superconducting quantum interference device, with cross-Kerr interactions dominating over on-site Kerr interactions. We apply a parametrically modulated magnetic flux to control the linear photon hopping rate between the two resonators and its ratio with the cross-Kerr rate. When increasing the hopping rate, we observe a crossover from an ordered to a delocalized state of photons. The presented coupling scheme is intrinsically robust to frequency disorder and may therefore prove useful for realizing larger-scale resonator arrays.

Original languageEnglish
Article number183601
JournalPhysical Review Letters
Volume122
Issue number18
DOIs
Publication statusPublished - 8 May 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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