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by alphydan 4459 days ago
>> i dont think you can keep them entangled while transporting them that kind of distance.

The main reason for this is decoherence (the pair of entangled photons interact with other photons, or particles along the way) ... and lose their connection because they have to share it with the other particles [1].

People have come up with clever tricks to fight that. It's called distillation of entanglement [2]. You share 1000 pairs of particles, all weakly entangled because they have travelled a long distance and rubbed with the wrong particles along the way. Then each party at each end combines the particles with some measurements and classical communications (phone or internet) and ends up with a single pair, far away, highly entangled.

[1] http://www.quantiki.org/wiki/Monogamy_of_entanglement

[2] https://en.wikipedia.org/wiki/Entanglement_distillation