By 2020, you could have an exascale speed-of-light optical computer on your desk

Optalysys optical computing: Multiple lasers, firing through multiple liquid crystal grids
Optalysys, a UK technology company, says it’s on-target to demonstrate a novel optical computer, which performs calculations at the speed of light, in January 2015. If all goes to plan, Optalysys says its tech — which is really unlike anything you’ve ever heard of before — can put an exascale supercomputer on your desk by 2020.

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