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A question on Quantum Entanglement

I have read a lot about quantum mechanics but have a query.
using an entangled photon for this question.

If you can’t measure an entangled photon without affecting it’s entanglement then how do we know it was even entangled to start with and not just always a certain “spin”, either up or down. How can we say for sure that it is both at the same time (entangled) with never observing or measuring this?

[LM posted this]

Response

As of now, We can only give you some links for further reference. Learnt visitors can respond with  an anwer.

Links recommended.

  1. http://plato.stanford.edu/entries/qt-entangle/
  2. http://www.wired.com/wiredscience/2010/06/human-quantum-entanglement-detector/
  3. http://en.wikipedia.org/wiki/Quantum_entanglement
  4. http://en.wikipedia.org/wiki/EPR_paradox
  5. http://calitreview.com/51

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