Illustration of the entanglement of two distant quantum memories, operating at different wavelengths, using telecom photons transmitted over an internet fiber. Operation of the photon-pair source at the wavelengths shown on the left was demonstrated in the paper by Fekete et al. . The source on the right can be constructed by the same approach and is easier to realize because the generated wavelengths are closer. In this example, entanglement is created by measurement of identical 1436 nm photons, each produced by a different photon-pair source and interfered on a 50% beam splitter.