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Unconventional photon blockade refers to the suppression of multi-photonstates in weakly nonlinear optical resonators via the destructive interferenceof different excitation pathways. It has been studied in a pair of couplednonlinear resonators and other few-mode systems. Here, we show thatunconventional photon blockade can be greatly enhanced in a chain of coupledresonators. Specifically, the strength of the nonlinearity in each resonatorneeded to achieve unconventional photon blockade is suppressed exponentiallywith lattice size. The analytic derivation, based on a weak driveapproximation, is validated by wavefunction Monte Carlo simulations. Thesefindings show that customized lattices of coupled resonators can be powerfultools for controlling multi-photon quantum states.

Giant Enhancement of Unconventional Photon Blockade in a Dimer Chain