We’ve Got One Big Step Closer to Teleporting Images Using Only Light

Teleportation in quantum states promises to play a key role in securing tomorrow’s information superhighway.

Despite the progress made, the process remains slow and somewhat clunky. That could change, with scientists using a new process that can efficiently teleport states of light to form an image using a pair of entangled photons.

The team, from South Africa, Germany, and Spain, is hopeful that the innovation will help build secure networks in the future: if key data cannot be transmitted, then it cannot be stolen.

“Traditionally, two communicating parties physically send information from one to the other, even in the quantum realm,” said physicist Andrew Forbes, from the University of the Witwatersrand.

“Now, it’s possible to teleport information so it doesn’t physically travel across the nexus which is a Star Trek technology made real.”

About the experimental setup. (University of the Witwatersrand)

The research builds on the idea of ​​quantum entanglement, where separated particles remain linked through the wonders of quantum physics. The state of one particle tells us something about another particle, even if there is a great distance between them.

Two photon traps were used here, but the researchers were able to pack more information into them than normal so the potential to encode images. Furthermore, this additional information is successfully ‘teleported’ from one point to another.

However, this is not teleportation in the standard sense. While the information itself is not transferred (like an internet connection for example), the careful measurement of a specific part of one of the trapped particles can immediately affect the corresponding part of the other, effectively transmitting the state in its quantum.

By transferring the actual details of the original measured particle in the old-fashioned non-teleport way, it is possible to lock that state in place, while the original state is destroyed.

While this isn’t a faster way to send information, it makes a handy quantum watermark for any information you don’t want others to see.

In this latest experiment, the researchers show how a new detection method can provide the necessary measurements of the photon’s angular momentum, increasing the number of dimensions it can be teleported to. a quantum state.

“This protocol has all the hallmarks of teleportation except for one important component: it requires a bright laser beam to make the nonlinear detector efficient, so that the sender knows what to send, but does not need to know -an,” said. Forbes.

“In this sense, it is not strictly teleportation, but may be in the future when nonlinear detectors become more efficient.”

bank fingerprint
How technology can be used. (University of the Witwatersrand)

The “nonlinear detector” mentioned here is another important part of the setup, both to manage the additional capacity of the involved photons, and to ensure that the information is accurately transmitted from one point to another. .

One way it could be used in the future, the researchers suggest, is to send your fingerprint to a bank. By teleporting the spatial details of your fingerprint in the form of a quantum state, future security measures could create a key that can effectively lock a box of digital information, one that personalized to your body..

While the physics at play here is quite complex, now that the proof-of-concept experiment has been conducted in the lab, we can expect further progress in the field of quantum teleportation.

“We hope that this experiment that shows the feasibility of the process stimulates further development in the nonlinear optics community by pushing the limits towards a full quantum implementation,” said physicist Adam Valls, from the Institute of Photonic Sciences (ICFO) in Spain.

The research was published in Communication in Nature.

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Image Source : www.sciencealert.com

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