Yes, it's possible to do incredibly fast signal processing calculations using interfering laser beams. http://www.nextbigfuture.com/2014/08/startup-with-optica

Yes, it's possible to do incredibly fast signal processing calculations using interfering laser beams. http://www.nextbigfuture.com/2014/08/startup-with-optical-solver.html?m=1 http://www.nextbigfuture.com/2014/08/startup-with-optical-so... In practice, it's not easy to compete with the economies of scale of conventional chips, though.