How to store a picture in a cloud of gas

2019-03-02 05:02:00

By David Robson IT’S like catching a moonbeam – using a cloud of vapour to capture images made of light itself. Right now, the result looks like something you’d see on a faulty LED display, but it could one day form the basis of a new type of computer memory. First, rubidium atoms are exposed to a “pump” laser, putting them into an excited quantum state. This makes them transparent to pulses of light from a second laser, known as the “probe” beam,