DCQE - inserting eraser after s is detected

[San K]

In the below experiment the eraser is in the path of p-photon before s is detected.

Then s is detected and then p photon encounters the polarizer and then Dp.

If we were to insert the polarizer after s is detected, would the pattern/results change? relative to just keeping the polarizer in the path all the time...as in the experiment below

Please see the link and the section referred to below:

http://grad.physics.sunysb.edu/~amarch/ Next the erasure measurement is performed. Before photon p can encounter the polarizer, s will be detected. Yet it is found that the interference pattern is still restored. It seems photon s knows the "which-way" marker has been erased and that the interference behavior should be present again, without a secret signal from photon p.

 

[Demystifier]

Niels Bohr famously said:
"If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet."

In this spirit, I would add:
"If delayed choice quantum eraser shocked you more than the rest of quantum mechanics, you haven't understood quantum mechanics yet."