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Transferring an unknown quantum state over arbitrary distances is essential for large-scale quantum communication and distributed quantum networks. It can be achieved with the help of long-distance quantum teleportation and entanglement distribution. The latter is also important for fundamental tests of the laws of quantum mechanics. Although quantum(More)
 Previous attempts • HOM interferometer is demonstrated at laboratory. • HOM interferometer is demonstrated with fiber channels. • In previous free-space quantum experiments, quantum operation was implemented at the transmitter, and then the photons are transmitted to the receiver. • In free space, to the best of our knowledge, no HOM interference has been(More)
We report a free-space entanglement-based quantum key distribution experiment, implementing the biased basis protocol between two sites which are 15.3 km apart. Photon pairs from a polarization-entangled source are distributed through two 7.8-km free-space optical links. An optimal bias 20:80 between the X and Z basis is used. A post-processing scheme with(More)
Throughout history, every advance in encryption has been defeated by advances in hacking with severe consequences. In theory, quantum cryptography [1, 2] holds the promise to end this battle by offering unconditional security [3–5] when ideal single-photon sources and detectors are employed. In practice, unfortunately, the battle revives due to the gap(More)
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