Phys.org April 11, 2022
Short-distance quantum encryption is already used commercially. However, to implement a global quantum network, photon loss becomes in issue. An international team of researchers (Australia, USA – NIST) demonstrated an error reduction method that improved the performance of a channel. They sent a photon which is not carrying any useful information, through the loss. Using a noiseless linear amplifier, they corrected for the effects of loss and recovered the lost quantum state to teleport the information they wanted to transmit into the now corrected carrier, avoiding all the loss on the channel. The arbitrary quantum information transmission is unconditionally improved compared to the uncorrected channel. According to the researchers the next step in their study would be to reduce the errors to a level where the team could implement long-distance quantum cryptography, and test the method using real-life optical infrastructure, such as those used for fiber-based internet…read more. Open Access TECHNICAL ARTICLEÂ
Concept and layout of the experimental apparatus. Credit: Nature Communications volume 13, Article number: 1832 (2022)Â