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Quantum cryptography allows confidential information to be communicatedbetween two parties, with secrecy guaranteed by the laws of nature alone.However, upholding guaranteed secrecy over quantum communication networks posesa further challenge, as classical receive-and-resend routing nodes can only beused conditional of trust by the communicating parties. Here, we demonstratethe operation of a quantum relay over 1 km of optical fiber, which teleports asequence of photonic quantum bits to a receiver by utilizing entangled photonsemitted by a semiconductor LED. The average relay fidelity of the link is0.90+/-0.03, exceeding the classical bound of 0.75 for the set of states used,and sufficiently high to allow error correction. The fundamentally lowmulti-photon emission statistics and the integration potential of the sourcepresent an appealing platform for future quantum networks.

An entangled-LED driven quantum relay over 1 km