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## Main Question or Discussion Point

In the book 'Quantum Physics', Alastair Rae uses polarized photons and photon detectors to describe many effects observed in quantum physics. In his typical setup, photons are passed through a polarizer and exit it through two different channels depending on the polarization [itex]\phi[/itex] or [itex]\phi+90^\circ[/itex] they then have. Behind each channel, there is a photon detector to tell through which of the two channels "the" photon exited.

Now my question: Where does the wave function representing the photon collapse?

Now my question: Where does the wave function representing the photon collapse?

- Does it happen in the polarizer, when the photon's polarization is decided to be either [itex]\phi[/itex] or [itex]\phi+90^\circ[/itex], or
- does the wave function collapse only later in the detector?