Spies using the internet to collect data and spy on others might need to start looking for alternatives.
A team of researchers from the TU Delft will publish a paper in SCIENCE tomorrow which might make completely secure internet connections reality, using the power of quantum mechanics.
In the article the team of Ronald Hanson of TU Delft, and partners from Oxford university give an example of how quantum internet could look like in practical application. The great strenght of quantum networking lies in that it is impossible to intercept the signal to listen in on it. The observation would instantly destroy the information carried. So far the main problem has been that is was deemed impossible to get the signal amplified enough to make it from sender to reciever.
With normal glass fibre signal transmission, the signal is measured, amplified and rerouted between nodes until it reaches it's destination. This is not possible with quantum signals, because measuring would break the quantum state.
What the Delft team has accomplished, is that instead of measuring and amplifying, they copy the unobserved quantum bits into a diamond raster. Experiments in the lab show that this diamond raster establishes ever improving connection with other diamond rasters in the network. Weak signals are filtered out.
Carlo Beenakker, quantumphysicist from Leiden university, himself not involved in the research paper, says "the paradox is that you have to blindfold yourself to be able to amplify the signal correctly. A metaphorical description of the process would be 'destillation'. By continously repeating the procedure, the end product gets stronger and stronger."
He adds "What's interesting is that the Delft team's experiment took place within a chip-like system. We could already do this with light, but electronics are much closer to practical applications in telecommunication".
So far, the network experiments of Delft University only show it's effectiveness over a few meters. However, according to team leader Hanson, upscaling is very much possible. The same Hanson showed in earlier experiments on the TU Delft campus that quantum connections can easily reach several kilometers, as predicted by Einstein.
The work on unbreakable quantum connections is part of a larger project of, amongst others, the university of Amsterdam, university of Leiden, university of Delft and university of the Hague. Last year, the dutch government granted an additional 19 million euros to the project.
One of the project's aims is to have the first experimental, working quantum internet in the world, between the participating universities, within 5 years. They will make use of existing fibre optic networks, supplemented with new quantum nodes.
Dutch telecom company KPN and the ministry of Defense are following the project with great interest.
http://www.volkskrant.nl/tech/spionnen-opgelet-er-wordt-gewerkt-aan-een-volledig-onafluisterbaar-internet~a4498404/