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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)
54 Downloads (Pure)


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
Issue number18
Publication statusPublished - 8 May 2019

ASJC Scopus subject areas

  • General Physics and Astronomy


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