Recent articles in the science press have highlighted a new developement in Wheeler-Feynman reverse causation or "Retrocaustion".
planned experiments involving adaptions of a model for and optical quantum signalling device have thrown open the possibility of a proof (or disproof) of quantum retrocausation.
The Device which involves splitting a beam of light so that 'entangled photon streams" are created. Both streams of photons whould be resolved into either photons or an interference pattern via a movable detector set beyond an Young's style double slit. The signalling side would move the detector so that measurement of either state could occur and a fixed detector on the other stream would be set to constantly monitor one state. The upshot of which is that as the state of one stream is resolve the quantum entanglement should make the other stream resolve in the same manner.
As the entanglements occur across paired photons the signal (which state is resolved) would arrive at the time that the stream with the longest journey containing that photon arrives. (speed of light transit, so far so not all that interesting) Signals would need to be sent via oscillating changes in wave/particle resolution.
The interesting bit occurrs when one swaps the movable with the fixed detector. The measurement resolving the stream would be made later than the fixed detector. Due to the instantaneous nature of state changes transmitted across quantum pairs the changing state would occur after the measurement by the first device.
Potientially the state change enforced now would be enforced on the detected state a few microseconds ago causing the signal to arrive earlier than it was sent by a factor of the distance travelled.
What do you chaps think?
Where would we stand if it could be conclusively prove the current events can influence the past?
The interesting part is not the device, but he potiential proof/disproof of retrocausation.
R