Have you ever wished you could go back in time and change your decisions? If only knowledge from today could travel back in time with us, we could alter our actions to our advantage. For now, such time travel is the stuff of fiction, but a trio of researchers have shown that by manipulating quantum entanglement, one can, at least, design experiments that simulate it.
Writing in Physical Review Letters, David Arvidsson-Shukur of the Hitachi Cambridge Laboratory, UK; Aidan McConnell of the University of Cambridge, UK; and Nicole Yunger Halpern of the US National Institute of Standards and Technology (NIST) and the University of Maryland propose a set-up in which an experimentalist sends information back in time to retroactively – in effect – change their actions in a way that produces optimal measurements. Intriguingly, the trio reveal that such simulated time travel in entangled systems can facilitate physical advantages that would be impossible to achieve in purely classical systems.
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