  The nonlocal action of a measurement performed on a quantum entangled
particle can determine the quantum state of a distant entangled particle
instantly. Since the relativistic simultaneity of events is frame dependent
therefore, a physically valid question arises, does the nonlocal action at a
distance determine the quantum state of the distant particle in its past, when
quantum state collapse is observed from a different inertial frame of
reference? From the relativity of simultaneity, Lorentz invariance of the
quantum entangled state of photons under consideration and the validity of
Bell's theorem in all inertial frames of reference, it is demonstrated that the
measurement-induced collapse of a quantum entangled state also determines the
quantum state of a distant photon in its past, provided one of the photons is
located in the future. The past and future are defined with respect to the time
of quantum state collapse in the rest frame of a quantum state measurement
device.

Quantum Physics