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The photon travels the full distance between Alice and Bob to interfere with itself and be detected. So not faster than light. You may be confusing this with entangled photons which this would also probably work for although this shows you only need the one photon so entangling multiple photons would be a waste of time.



... you’re right. I expected them to use entangled photons (which would have achieved the same but without the delay) and that shaped how I read the article.




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