Probing photon correlations in the dark sites of geometrically frustrated cavity lattices

Abstract

We theoretically explore the driven-dissipative physics of geometrically frustrated lattices of cavity resonators with relatively weak nonlinearities, i.e. a photon-photon interaction smaller than the loss rate. In such systems, photon modes with zero probability at 'dark' sites are present at the single-particle level due to interference effects. In particular, we study the behavior of a cell with three coupled resonators as well as extended Lieb lattices in 1D and 2D. By considering a partial pumping scheme, with the driving field not applied to the dark sites, we predict that even in presence of relatively weak photon-photon interactions the nominally dark sites achieve a finite photonic population with strong correlations. We show that this is a consequence of biphoton and multiphoton states that in the absence of frustration would not be visible in the observables.

Accepted for publication in PRA

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