I have two photons that are entangled and exist in all possible states simultaneously. By measuring photon A, I cause the superposition to collapse, and i can see that it has a certain spin (say left). This measurement also causes photon B's superposition to collapse, but will it be spinning left or right? Is spin conserved? If so, then should photon B be spinning right? In some articles i have read, the photons both spin in the same direction, and in others it is in opposite directions.