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We review the unconventional photon blockade mechanism. This quantum effect remarkably enables a strongly sub-Poissonian light statistics, even from a system characterized by a weak single-photon nonlinearity. We revisit the past results, which can be interpreted in terms of quantum interferences or optimal squeezing, and show how recent developments on input-output field mixing can overcome the limitations of the original schemes towards passive and integrable single-photon sources. We finally present some valuable alternative schemes for which the unconventional blockade can be directly adapted.
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Flayac et al. (2017) studied this question.
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