The Parallel Universe

Quantum entanglement through time or QETT allows us to travel back through time but to a parallel universe. I will kill Adolf Hitler here in this timeline and free this world from tyranny. But when I return home, everything will still be the same. The trick you see is to travel to a timeline which has very little variation from our own. After all there's no point travelling to a timeline where Hitler never existed or where he was the good guy.