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## Main Question or Discussion Point

Do we know if entanglement between two entangled particles is completely severed after the particles interact? By interact I am generally thinking of interacting with the measurement device.

Maybe another way of asking my question:

In an EPR like experiment, if you put one of the entangled photons through two polarizers (instead of a single one) that are at different angles is it possible to determine from the result of the second polarizer whether the second polarizer had any correlation effect on the other entangled photon based on what you know the first polarizer's correlation effect should have been?

This modified EPR experiment should be something that can be mathematically described by QM. I don't know how to properly formulate it yet. Does the QM math that describe this modified EPR experiment allow you to treat the addition of the second polarizer as a separate system that can be treated independently of the part of the system that encompasses the original unmodified EPR experiment?

Maybe another way of asking my question:

In an EPR like experiment, if you put one of the entangled photons through two polarizers (instead of a single one) that are at different angles is it possible to determine from the result of the second polarizer whether the second polarizer had any correlation effect on the other entangled photon based on what you know the first polarizer's correlation effect should have been?

This modified EPR experiment should be something that can be mathematically described by QM. I don't know how to properly formulate it yet. Does the QM math that describe this modified EPR experiment allow you to treat the addition of the second polarizer as a separate system that can be treated independently of the part of the system that encompasses the original unmodified EPR experiment?