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Integrated photonics capable of incorporating rare earth ions with highoptical coherence is desirable for realizing efficient quantum transducers,compact quantum memories, and hybrid quantum systems. Here we describe aphotonic platform based on the SmartCut erbium-doped lithium niobate thin film,and explore its stable optical transitions at telecom wavelength in a dilutionrefrigerator. Optical coherence time of up to 180\,$\mu$s, rivaling the valueof bulk crystals, is achieved in optical ridge waveguides and ring resonators.With this integrated platform, we demonstrate tunable light-ion interaction andflexible control of optical thickness by exploiting long waveguides, whoselengths are in principle variable. This unique ability to obtain high opticaldensity using a low concentration ions further leads to the observation ofmulti-echo pulse trains in centimeter-long waveguides. Our results establish apromising photonic platform for quantum information processing with rare earthions.

SmartCut Er:LiNbO3 with high optical coherence enabling optical thickness control