Imagine 2 entangled photons came into existence and one of them are being measured... We have altered one of the quantum state of the photon and caused it's wavefunction to collapse and then we measured it's is spin up. Since we know the other pair must be spin down because both the photons are correlated mathematically speaking I am not sure if any physical exchange is going on but right now I trust SR no information can beat the cosmic speed limit. Now I want to know what happens to the other photon did it's wavefunction collapsed too because we knew it is spin down although we never directly interact with it?

Imagine two entangled photons came into existence and one of them is being measured. We have altered one of the quantum states of the photon and caused its wavefunction to collapse and then we measured it's is spin up. Since we know the other pair must be spin down because both the photons are correlated mathematically speaking I am not sure if any physical exchange is going on but right now I trust SR no information can beat the cosmic speed limit. 

Now I want to know, what happens to the other photon, did its wavefunction collapse too because we knew it is spin down although we never directly interacted with it?