Seminarium Optyczne

We show that a long-distance quantum communication can be based on multiphoton bipartite entanglementand photon-number-resolved detection, the resources provided by the current quantumphotonictechnology. The protocol is robust to high transmission losses and o ers near-maximallyentangled states in realistic implementations. It can be realized in a delayed-choice scheme and itallows one to perform loophole-free Bell tests. The schema discussed can be employed as a sourceof entanglement for e.g. establishing an Earth-to-space quantum channel, quantum metrology andquantum key distribution.