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Delayed-choice multi entanglement swapping

  1. Apr 3, 2014 #1
    This idea is brought on by this paper: http://arxiv.org/abs/1210.5646
    and the idea proposed by Asher Peres: http://arxiv.org/abs/quant-ph/9904042

    is it possible to have delayed choice multi-entanglement swapping? i.e. create four pairs of photons – 1+2, 3+4, 5+6 and 7+8. Measure photons 1 and 8 first, then swap entanglement between the remaining six photons. I.e. bell-state measure photons 2 and 3, then bell-state measure photons 4 and 5. Then bell-state measure 6 and 7. I hope that made sense. I’m thinking the details out in my head.

    Would that, in the end, make photons 1 and 8 entangled? If not, what scheme similar to the above would?

    Many thanks
  2. jcsd
  3. Apr 4, 2014 #2


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    you can read this
  4. Apr 5, 2014 #3

    Thanks for that article.

    Why is it that when photons 4 and 5 are detected in a certain bell-state, photons 1 and 6 are detected in a different bell-state? I thought they would be detected in the same bell-state as 4 and 5.

    Could someone shed some light on this?
  5. Apr 6, 2014 #4


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    the three pairs are supposed to be Ψ- (post selection? how?)
    The author could have chosen 2-3 to be Ψ- 1-4 would have been also Ψ-
    there is a second choice with 4-5 if you still choose them to be Ψ- 1-6 will be also Ψ-
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