ProfessorJeff Pride, Ph.D. Sergey Slyusarenko (Belarus), Ph.D.Sasha Kocsis and Dr. Morgan Weston together with
Dr. Slyusarenko said that their study demonstrated an error reduction method that improved channel performance.
“First, we looked at rawdata transmitted over our channel, and saw that the best quality signal passed precisely when using our method, he said. “In the experiment, we corrected for the effect of losses with a device called a noiseless linear amplifier developed at Griffith and the University of Queensland. He can restore the lost quantum state. After successful recovery, we use another purely quantum protocol called quantum state teleportation to transfer information to the corrected medium, avoiding all channel losses.”
Slyusarenko also added that the next step inthis study will reduce errors to a level where the team can implement quantum cryptography over long distances and test the method using real optical infrastructure, the same as those used today for fiber optic internet.
“Quantum encryption over short distances is alreadyused for commercial purposes, however, if we want to implement a global quantum network, the loss of photons becomes a problem, as it is inevitable,” said Dr. Slyusarenko.
The scientist noted that the Griffith University study will realize a quantum relay that will become the main component of a long-distance communication network.
"The no-cloning theorem forbidscopying unknown quantum data, so if a photon carrying information is lost, the information it carried will disappear forever,” notes Slyusarenko. “A working long-distance quantum communication channel needs a mechanism to reduce this loss of information, which is what we did in our experiment.”
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