Richard Feynman brings to light quantum electrodynamics and a solution to Schrodinger's 'Cat-in-the-Box Experiment'

Time Reversibility

Richard Feynman (1918-1988) was a genius who developed a new approach to quantum mechanics. He formalised its crowning achievement, Quantum Electrodynamics, which is the most accurate scientific theory ever devised. He also developed the Feynman Diagram, which represents the interaction of two particles as the exchange of a third particle.

This diagram has time on one axis and space on the other and the interaction can be viewed as happening both in forward and in reverse time.

An electron, on its way from point A to point B, can bump into a photon. In the diagram this can be drawn as sending it backwards not just in space, but also in time. Then it bumps into another photon, which sends it forward in time again, but in a different direction in space. In this way, it can be in two places at once.

There is little doubt that a Feynman diagram offers the easiest way to predict the results of a subatomic experiment. Many physicists have seen the power of this tool and taken the next step, arguing that reverse time travel is what actually happens in reality. Victor Stenger of the University of Hawaii argues strongly for this ontology in his forthcoming book. Of course, for a layman, it is hard to understand why a photon bounces around in such a way that it appears in two slits at once.