A major turning point towards the quantum Internet

A major turning point towards the quantum Internet

(Paris) By creating a basic network for exchanging information through three-fold teleportation, researchers have taken a key step towards a highly secure quantum Internet, they revealed in a study on Wednesday.

Released at 12:29 p.m.

Juliet Golan
French Media Company

A quantum Internet – which should not see the light of day for ten years – is a large-scale network that connects users with new applications and is “unattainable through the classic web,” explains AFP Ronald Johnson of the University of Delft (Netherlands), co-author of the book published in the journal Natural.

Communication does not take the form of classic bits – 0s and 1s at the base of computing – but quantum bits (kubits).

These quits use the laws of quantum physics, which govern the world on an infinitely small scale. One of these properties, also called complexity, is a strange phenomenon in which two trapped particles act identically regardless of the distance they are separated: they share the same position as if they were connected by an invisible thread.

The state of the trapped quilt is shared with the other, and their integration is so perfect that we are talking about teleportation: in theory, any change in the properties of one immediately alters the properties of the other at the other end of the earth. .

Quantum bits can currently be transmitted via optical fibers, but teleportation is limited: beyond a hundred kilometers, the signal is weakened or lost. If we want to maintain the end-to-end problem, the quits must be connected directly by a quantum “chain”.

Alice, Bob and Charlie

This is the achievement described in the study by Natural, Scientists introduced the relay to extend the range of communication. Quantum communication, which was only for two actors commonly known as Alice and Bob, can now be relied upon as the third character, Charlie.

The experiment took place at two of Qtech’s laboratories, in collaboration with Delft University of Technology and the Dutch company DNO.

Diamond-based quilts are placed on a circuit that is interconnected by three so-called “quantum nodes”. The Alice and Bob nodes are located in two labs several meters apart and are connected by fiber optics, as well as directly by Bob Charlie. Alice and Charlie can’t talk to each other now.

The researchers first tracked down the physically connected ends (the Alice-Bob pair and the Bob-Charlie pair). Bob was then used as a mediator and, through the process of changing the issue, was able to trap Alice and Charlie.

Although not physically connected, the latter two were able to send a message directly to each other. The signal was of excellent quality without any loss – a challenge given the extreme instability of a quantum bit.

According to quantum rules, this exchange could take place in the utmost secrecy: with trouble, any attempt to intercept or hear the message would automatically change the quid and destroy the message itself.

This first nucleus quantum teleportation network paves the way for large-scale connections: it demonstrates on a laboratory scale the principle of a reliable quantum repeater – the popular pop – which can be placed between two nodes at a distance of 100 km, thus increasing strength. Of the signal.

The novelty is described Natural “Success for basic science” and “real-world solution to take applied quantum physics to the next level,” the scientists said in a commentary on “News and Views” published on the sidelines of the study. Natural.

When he talks about the quantum Internet, physicist Ronald Johnson describes a universe where communications are “highly-secure” and “quantum computers can access our data with the privacy guaranteed by the ‘natural’ laws of physics. Hypersensitivity sensors”.

Discovering applications in the quantum web is “a field of research in itself,” adds the researcher who believes this new world will be born “within 20 years”.

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