Single particles of light, also known as photons, have been produced and implemented into a quantum key distribution (QKD) link, paving the way for unbreakable communication networks.
The results of the experiment, undertaken by a close collaboration of researchers based in Wuerzburg, Munich and Stuttgart, have been published August 2, in the Institute of Physics and German Physical Society's New Journal of Physics.
The single photons were produced using two devices made of semiconductor nanostructures that emitted a photon each time they were excited by an electrical pulse. The two devices were made up of different semiconductor materials so they emitted photons with different colours.
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