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We demonstrate the generation of multi-photon quantum states of light bycavity-enhanced parametric down-conversion in the high-repetition-rate pulsedregime. An external enhancement cavity resonant with the spectral comb of modesof a mode-locked pump laser provides a coherent build-up of the pump intensityand greatly enhances the parametric gain without sacrificing its highrepetition rate and comb structure. We probe the parametric gain enhancement bythe conditional generation and tomographic analysis of two-photon Fock states.Besides its potential impact to efficiently generate highly-nonclassical orentangled multi-photon states in many existing experimental setups, this schemeopens new and exciting perspectives towards the combination of quantum and combtechnologies for enhanced measurements and advanced quantum computationprotocols.

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Towards quantum frequency combs: boosting the generation of highly  nonclassical light states by cavity-enhanced parametric down-conversion at  high repetition rates