Long-distance quantum teleportation assisted with free-space entanglement distribution

Faithful long-distance quantum teleportation necessitates prior entanglement distribution between two communicated locations.The particle carrying on the unknown quantum information is then combined with one particle of the entangled states for Bell-state measurements,which leads to a transfer of the original quantum information onto the other particle of the entangled states.However in most of the implemented teleportation experiments nowadays,the Bell-state measurements are performed even before successful distribution of entanglement.This leads to an instant collapse of the quantum state for the transmitted particle,which is actually a single-particle transmission thereafter.Thus the true distance for quantum teleportation is,in fact,only in a level of meters.In the present experiment we design a novel scheme which has overcome this limit by utilizing fiber as quantum memory.A complete quantum teleportation is achieved upon successful entanglement distribution over 967 meters in public free space.Active feed-forward control techniques are developed for real-time transfer of quantum information.The overall experimental fidelities for teleported states are better than 89.6%,which signify high-quality teleportation.