Abstract
We demonstrate entanglement between the polarization of an infrared photon and a metastable Sr ion qubit. This entanglement persists after transmitting the photon over a km long commercial fiber deployed in an urban environment. Tomography of the ion-photon entangled state yields a fidelity of within the laboratory and after fiber transmission, not corrected for readout errors. Our results establish the Strontium ion as a promising candidate for metropolitan-scale quantum networking based on an atomic transition at nm, a wavelength compatible with existing telecom fiber infrastructure.