A single Rb-87 atom and a 1522 nm telecom photon were entangled, and after 20 km of fiber the atom-photon fidelity was at least 78.5±0.9% with CHSH S=2.12±0.05.
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Long-distance distribution of atom-photon entanglement at telecom wavelength
A single Rb-87 atom and a 1522 nm telecom photon were entangled, and after 20 km of fiber the atom-photon fidelity was at least 78.5±0.9% with CHSH S=2.12±0.05.