what happed to the other, if one entangled particle is "destroyed" if one entangled particle is "destroyed" what is the state of the OTHER particle? Situation 1 two entangled particles, A and B(assume have mass). if A is "destroyed", say it hit a wall :). What happen to the B's momentum and location? Situation 2 two entangled photons, A and B. if A is "destroyed", assume photoelectric effect. What happen to the other photon's spin? Would B return to NO SPIN? Keep its spin? or other results? In a word, Is "destruction" considered as some-sort-of "measurement"? Does the wave function, in a destruction, collapse the same way as in a measurement? What is the mathematical operator for "destruction"(if it is considered as a measurement)?