Spin-photon entanglement of a single Yb-171 atom in the telecom band

Long-distance quantum networking brings us the infrastructure for secure communication, distributed quantum computing and an entangled quantum sensor network. The neutral Yb-171 atom is a great candidate for both quantum computing and quantum repeaters since its level structure provides high fidelity quantum memories, gate operations, measurements and strong coupling to the telecom wavelength photon. In this talk I will introduce our recent work generating the atom photon entanglement of the Yb-171 at 1389 nm (fibre loss coefficient < 0.3 dB/km). We demonstrate the high-fidelity time-bin encoded spin photon entanglement and measurements using an unbalanced Mach-Zehnder interferometer, which is the key component for building quantum repeaters.