Is teleportation scientifically possible through quantum entanglement?

Successful quantum teleportation between silicon chips for the first time

Since in the world of quantum physics information can in principle be shifted from one place to another as if by magic, the data transmission of the future could also work in the same way. In the quantum internet, however, it should also be possible to reliably copy and forward the volatile information. Physicists have now presented a new approach to this in the journal "Nature Physics".

The international team with the participation of Marcus Huber from the Institute for Quantum Optics and Quantum Information (IQOQI) Vienna of the Austrian Academy of Sciences (ÖAW) has dealt with the question of how to avoid the fact that information cannot simply be copied in quantum mechanics. In order to transmit data over long distances without loss in the quantum internet, it would have to be regularly refreshed between different nodes with a so-called repeater - just like in the conventional internet.

One solution lies in the strange phenomenon of quantum entanglement: This makes it possible for two particles - such as light particles (photons) - to remain connected to one another as if by magic. The measurement on one directly determines the condition of the other, even if they are as far apart as you want. In this context, one speaks of quantum teleportation.

Quantum repeater

The scientists have now researched how information can be exchanged between entangled photons that are located on two separate silicon chips. In their experiment with quantum information, they fed entangled light particles charged into spatially separated silicon chips. Then they managed to transmit the information indirectly. By measuring the photon on the first chip, it became possible to derive the original state of the first from the change in the entangled photon on the other chip. The information was thus copied indirectly.

A quantum repeater of this type is currently still a proof of concept. "If we succeed in improving and scaling the technology, that could be a basis for a future quantum Internet," said Marcus Huber, who and his team were able to prove that their colleagues from the University of Bristol were successful with their approach. This is particularly promising because it can in principle be implemented with established components such as silicon chips and fiber optic cables. (APA, red, December 24, 2019)