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How long does entanglement last?

  1. Jan 21, 2013 #1
    once entangled photons are created (via say SPDC or quantum dots etc) .....how long does the entanglement last?

    there is so much noise in the environment
    so many things the entangled photons would interact with,
    so many ways to transfer/exchange momentum with the surroundings
     
  2. jcsd
  3. Jan 21, 2013 #2
    I'm not sure if someone has recorded longer than this for this size objects?
    Entanglement Generated by Dissipation and Steady State Entanglement of Two Macroscopic Objects
    http://prl.aps.org/abstract/PRL/v107/i8/e080503
    http://lanl.arxiv.org/pdf/1006.4344.pdf (full article pre-print)
     
    Last edited: Jan 21, 2013
  4. Jan 21, 2013 #3
    You've more or less answered your own question: entanglement lasts as long as you can effectively mitigate those external factors. The larger the system is, the more difficult this is to do for extended periods.
     
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