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Multi-photon interference is central to photonic quantum informationprocessing and quantum simulation, usually requiring multiple sources ofnon-classical light followed by a unitary transformation on their modes. Here,we observe interference in the four-photon events generated by a single siliconwaveguide, where the different modes are six frequency channels. Rather thanrequiring a unitary transformation, the frequency correlations of the sourceare configured such that photons are generated in superposition states acrossmultiple channels, and interference effects can be seen without furthermanipulation. This suggests joint spectral engineering is a tool forcontrolling complex quantum photonic states without the difficulty ofimplementing a large unitary interferometer, which could have practicalbenefits in various applications of multi-photon interference.

Multi-photon interference in the spectral domain by direct heralding of superposition states