Expressway for quantum data traffic

An artist’s perception of an error correction protocol: the photons that are affected by the environment are fixed and then used to transport the data that is teleported into them. Credit: Maria Slussarenko

Teleportation may be a term usually reserved for science fiction, but researchers have shown that it can be used to avoid the loss of quantum-level communication channels.

The team, including researchers from Griffith University’s Center for Quantum Dynamics, have highlighted the issues surrounding inherent losses that occur across any type of communication channel (such as the Internet or telephone) and discovered a mechanism that can reduce this loss.

Professor Geoff Pryde, Dr. Sergei Slussarenko, Dr. Sacha Kocsis and Dr. Morgan Weston, along with researchers from the University of Queensland and the National Institute of Standards and Technology, says the result is an important step toward implementing “quantum internet.” which will bring unprecedented opportunities that are not available with today’s web.

Dr. Slussarenko said this study was the first to demonstrate a bug reduction method that improved a channel’s performance.

“First, we looked at the raw data that was transmitted via our channel and could see a better signal with our method than without,” he said.

“In our experiment, we first sent a photon through the loss – this photon does not carry any useful information, so losing it was not a big problem.

“We could then correct for the effects of loss via a device called the noiseless linear amplifier developed at Griffith and the University of Queensland.

“It can restore the lost quantum state, but it can not always succeed; sometimes it fails.

“But when recovery is successful, we use another pure quantum protocol – called quantum state teleportation – to teleport the information we wanted to send to the now corrected bearer and avoid any loss on the channel.”

Quantum technologies promise revolutionary changes in our information-based society, a quantum communication develops methods like the one demonstrated in this study to transfer data in an extremely safe and secure way so that it is impossible to access for a third party.

“Short-range quantum encryption is already used commercially, but if we want to implement a global quantum network, photon loss will be a problem because it is inevitable,” said Dr. Slussarenko.

“Our work implements a so-called quantum relay, a key ingredient in this long-distance communication network.

“The no cloning statement forbids making copies of unknown quantum data, so if a photon carrying information is lost, the information it carried is gone forever.

“A functioning long-distance quantum communication channel needs a mechanism to reduce this information loss, which is exactly what we did in our experiment.”

Dr. Slussarenko said the next step in this 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-time optical infrastructure, such as those used for fiber-based Internet. .

The study, “Quantum channel correction outperforming direct transmission,” has been published in Nature communication.

Quantum ‘scary action at a distance’ becomes practical

More information:
Sergei Slussarenko et al., Quantum channel correction surpasses direct transmission, Nature communication (2022). DOI: 10.1038 / s41467-022-29376-4

Provided by Griffith University

Citation: Quantum teleportation: The expressway for quantum data traffic (2022, 12 April) retrieved 12 April 2022 from

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