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Interference of multiple photons via a linear-optical network has profoundapplications for quantum foundation, quantum metrology and quantum computation.Particularly, a boson sampling experiment with a moderate number of photonsbecomes intractable even for the most powerful classical computers, and willlead to "quantum supremacy". Scaling up from small-scale experiments requireshighly indistinguishable single photons, which may be prohibited for manyphysical systems. Here we experimentally demonstrate a time-resolved version ofboson sampling by using photons not overlapping in their frequency spectra fromthree atomic-ensemble quantum memories. Time-resolved measurement enables us toobserve nonclassical multiphoton correlation landscapes. An average fidelityover several interferometer configurations is measured to be 0.936(13), whichis mainly limited by high-order events. Symmetries in the landscapes areidentified to reflect symmetries of the optical network. Our work thus providesa route towards quantum supremacy with distinguishable photons.

Time-resolved boson sampling with photons of different colors