The Duality of Time Theory

In 1955, Satosi Watanabe (1910-1993) studied the time reversal of quantum mechanics, he was the first physicist to show clearly that quantum probability theory is time-asymmetric, or non-invariant under time reversal. Several theories have been proposed which modify the equations of Quantum Mechanics to become symmetric with respect to time reversal, which creates retro-causality: events in the future can affect ones in the past, exactly as events in the past can affect ones in the future, making them a type of hidden variables. In these theories, a single measurement cannot fully determine the state of a system, but given two measurements performed at different times, it is possible to calculate the exact state of the system at all intermediate times.

The collapse of the wave-function is, therefore, not a physical change to the system, but just a change in our knowledge of it due to the second measurement. Similarly, they explain entanglement as not being a true physical state, but just an illusion created by ignoring retro-causality. The point where two particles appear to become entangled is simply a point where each particle is being influenced by events that occur to the other particle in the future.