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In entanglement swapping where AB from two entangled pairs AC and BD are projected into Bell state by Bell state measurement (https://en.wikipedia.org/wiki/Bell_state#Bell_state_measurement) on A and B then CD would be orthogonal to AB. So if AB are sent through such Bell state analyzer that distinguishes psi and phi states and sends them to different outputs X and Y would CD still be orthogonal to AB?

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    $\begingroup$ What is "joint Bell measurement"? Please make your question as clear and self-contained as possible. $\endgroup$ – DanielSank Oct 20 '15 at 15:10
  • $\begingroup$ What do you mean "distinguishes psi and phi states"? $\endgroup$ – Craig Gidney Oct 27 '15 at 17:28

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