Entangled light could help make time travel.
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References
Giovannetti, V., Lloyd, S. & Maccone, L. Quantum enhanced positioning and clock synchronization. Nature 412, 417 - 419 (2001).
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Ball, P. Perfect pulse goes the distance. Nature (2001). https://doi.org/10.1038/news010726-11
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DOI: https://doi.org/10.1038/news010726-11