Corkscrew light beams could lead to practical quantum computers
Who said light only had to travel in boring waves orparticles? Not Harvard. Its researchers have found a wayto spin light into complex states that promise breakthroughs in multiple fields. They’ve built metasurfaces whose elaborate optics combine two kinds of light momentum (orbital angular and spin angular) to send light into corkscrews, spirals or even fork-like shapes. If you want to change the light state, you just need to change the polarization of that light.
They’re not just for show, of course. The research team envisions these complex light states being very helpful for quantum optics and data, which could help quantum computersbecome a practical reality. They could also lead to high-powered imaging where a hole in the center of a light vortex could be changed to refocus on a subject. And it could also lead to better free-space opticalcommunication that can transmit through turbulent air and other conditions that scatter light. While it’s very early days for this exotic light manipulation, it could prove instrumental to computing in the long run.