iZPhysics

I read this interesting article about time travel, quantum mechanics, and the infamous grandfather paradox: Quantum Time Machine Lets You Travel to the Past Without Fear of Grandfather Paradox This got me thinking: I know that I can't use it to visit the past, but maybe to "view" the past. But I do have one question that is left unanswered. If I build such a device, could I use it to view the past before the device's existence? The reason I ask this is because I know that all time machine models proposed in General Relativity forbid time travel before the creation of the time machine due to the laws of causality. And in this Quantum Mechanics version of "Retrocausality" proposed by John Cramer, it only uses retarded time created by fiber optics and quantum entanglement to enable instantaneous communication between the particles. Therefore, the photon's nature (wave or particle) will be seen before the photon reaches the detector. http://www.seattlepi..._timeguy15.html Back to my main question: can I use it to view the past before its existence? Thanks!!