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Entanglement-based quantum networks require quantum photonic interfacesbetween stationary quantum memories and photons, enabling entanglementdistribution. Here we present such a photonic interface, designed forconnecting a $^{40}$Ca$^+$ single-ion quantum memory to the telecom C-band. Theinterface combines a memory-resonant, cavity-enhanced spontaneous parametricdown-conversion (SPDC) photon pair source with bi-directionalpolarization-conserving quantum frequency conversion (QFC). We demonstratepreservation of high-fidelity entanglement during conversion, fibertransmission over up to 40 km and back-conversion to the memory wavelength.Even for the longest distance and bi-directional conversion the entanglementfidelity remains larger than 95 % (98 %) without (with) background correction.

Telecom Quantum Photonic Interface for a $^{40}$Ca$^+$ Single-Ion Quantum Memory