While people get excited about future internets being powered by quantum particles, nobody really knows how that’s going to work yet. But Chinese physicists have taken a step in the right direction, by creating the world’s first quantum router. If it can be made to work on a large scale, quantum information will transform the way we send data: instead of sending just the 0s and 1s of digital code, quantum communication can send information in a superposition of states that represent both 0s and 1s at the same time.
The new device, offered up by Tsinghau University in China, creates a quantum photon, that is a superposition of two separate photons that are in horizontal and vertical polarized states. That quantum photon is then converted into two, lower power, photons, which both also share the same dual polarization. Then, a router can read data from one photon, which it destroys, and use the remaining one as the data signal.
It might sound simple, but its output may seem a little odd to the casual observer: what gets spit out is actually a probabilistic result, which isn’t always the same. But then, that’s just how the quantum world works. There is one snag, though: the device can only handle one quantum bit of data at a time, which makes it a proof-of-concept and little more.