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Detecting Entanglement

  1. Dec 5, 2011 #1
    First time poster:

    Is there any math out there that prohibits the following scenario from taking place:

    Alice and Bob are entangled. Is it possible to detect that Alice is entangled, without measuring Bob and without destroying the entanglement (or causing decoherence)?

    Note: I am not trying to detect any joint information shared between Alice and Bob, just the state of Alice's entanglement without looking at Bob.
  2. jcsd
  3. Dec 5, 2011 #2


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    Gold Member

    Welcome to PhysicsForums, shifty123!

    No single (or repeated) measurement on Alice will indicate the presence of entanglement. That is because entanglement is a joint state. I.e. there are no observables at the individual particle level that reflect entanglement.
  4. Mar 26, 2012 #3
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