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- A typical (ideal) photon polarization quantum entanglement setup with Alice and Bob.

- Alice and Bob detectors are constant at 90 deg. angle difference (such as they allways get perfect corelation with different result)

Plus:

- Between Alice and source we place a polarizer "Aa", in relative angle to Alice 45 deg.

- And we place a detector "Da" between Alice and Aa such as we know when a photon has passed polarizer Aa and it is heading towards Alice.

- We record the results of Alice and Bob, only if Da detects.

(if there is a technical problem of detecting a single photon after Aa without "stoping" it, please consider the experiment with something similar, such as light pulses)

Now what will happen?

Does not Da collapses wave function in QM?

Is there a possibility that the perfect correlation between Alice and Bob will continue?

Is there a similar experiment?

Thanks