Quantum teleportation and entanglement distribution over 100-kilometre free-space channels

Understand

A long standing goal for quantum communication is to transfer a quantum state over arbitrary distances.

• Free-space quantum communication provides a promising solution towards this challenging goal.
• Here, through a 97-km free space channel, we demonstrate long distance quantum teleportation over a 35-53 dB loss one-link channel, and entanglement distribution over a 66-85 dB high-loss two-link channel.
• We achieve an average fidelity of {80.4(9)}% for teleporting six distinct initial states and observe the violation of the Clauser-Horne-Shimony-Holt inequality after distributing entanglement.