Placing a particle of light in a superposition so that it is travelling both forwards and backwards in time could prove useful for quantum computation
HTTPS://WWW.NEWSCIENTIST.COM/ARTICLE/2346548-QUANTUM-TRICK-SEES-LIGHT-MOVE-FORWARDS-AND-BACK-IN-TIME-SIMULTANEOUSLY/Tags: superposition, quantum physics, quantum computing, optical quantum computing, Unlimit3d