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For electronic devices, photonic computer

Photonics: Because Light Travels Faster Than Electricity

Fibre optics (light) is used to transmit data via the internet but on the stationary computer, it’s the slower electrons that rule. Some researchers hope to change that

As Ryan Hamerly explains at IEEE Spectrum, optical fibers can carry more than electrical wires. But they face a limitation: But there is a big difference between communicating data and computing with it. And this is where analog optical approaches hit a roadblock. Conventional computers are based on transistors, which are highly nonlinear circuit elements—meaning that their outputs aren’t just proportional to their inputs, at least when used for computing. Nonlinearity is what lets transistors switch on and off, allowing them to be fashioned into logic gates. This switching is easy to accomplish with electronics, for which nonlinearities are a dime a dozen. But photons follow Maxwell’s equations, which are annoyingly linear, meaning that the output of an optical device…