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Faithful storage and coherent manipulation of quantum optical pulses are keyfor long distance quantum communications and quantum computing. Combining thesefunctions in a light-matter interface that can be integrated on-chip with otherphotonic quantum technologies, e.g. sources of entangled photons, is animportant step towards these applications. To date there have only been a fewdemonstrations of coherent pulse manipulation utilizing optical storage devicescompatible with quantum states, and that only in atomic gas media (makingintegration difficult) and with limited capabilities. Here we describe how abroadband waveguide quantum memory based on the Atomic Frequency Comb (AFC)protocol can be used as a programmable processor for essentially arbitraryspectral and temporal manipulations of individual quantum optical pulses. Usingweak coherent optical pulses at the few photon level, we experimentallydemonstrate sequencing, time-to-frequency multiplexing and demultiplexing,splitting, interfering, temporal and spectral filtering, compressing andstretching as well as selective delaying. Our integrated light-matter interfaceoffers high-rate, robust and easily configurable manipulation of quantumoptical pulses and brings fully practical optical quantum devices one stepcloser to reality. Furthermore, as the AFC protocol is suitable for storage ofintense light pulses, our processor may also find applications in classicalcommunications.

An integrated processor for photonic quantum states using a broadband light-matter interface