A global infrastructure for exchanging quantum information requires coherent communication over long distances. The demonstration of interference between photons from two unsynchronized sources could bring us a step closer to that goal.
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Weihs, G. Coherence by measurement. Nature Phys 3, 687–688 (2007). https://doi.org/10.1038/nphys737
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DOI: https://doi.org/10.1038/nphys737
