Quantum cryptography is one of the most promising quantum technologies of our time. The same exact information is generated at two different locations, and the laws of quantum physics guarantee that no third party can intercept this information. This creates a code with which information can be perfectly encrypted.
The team led by Prof. Marcus Huber of the Atomic Institute of the Vienna University of Technology developed a new type of quantum cryptography protocol, which has now been tested in practice in cooperation with Chinese research groups. While up to now photons were normally used which can be in two different states, the situation here is more complicated. Eight different paths can be taken by each of the photons. As the team has now been able to show, this makes the generation of the quantum cryptographic key faster and also significantly more robust against interference. The results have now been published in the scientific journal "Physical Review Letters".
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