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Methods of keeping photons entangled for extended periods?

  1. Sep 15, 2014 #1

    I am interested in conducting a retro-causality experiment to send a bit of data back in time. I would like to delay how long it takes one of a pair of entangled photons to reach a part of the experiment for an extended period of time such as an hour.

    What ways are there to keep a photon in superposition? Is there a way to reflect between mirrors indefinitely?

    I read that a Bose-Einstein Condensate could slow light. How does that work? How long of a delay could be created that way?

  2. jcsd
  3. Sep 15, 2014 #2


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    Here is the longest I have seen anything entangled... it is an hour but it is not a photon:


    What kind of retro-causal experiment are you thinking about? There have already been a number performed. But they do not support transmission of information.
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