Quantum Internet: The leap forward comes from a “common” 120-euro fiber optic cable.

A groundbreaking breakthrough in Edinburgh: researchers have combined two quantum networks, transforming the "chaos" of light into a resource. And Great Britain is investing heavily in these innovations.

For years, we've been told about the Quantum Internet as the next frontier: a global, secure, and incredibly powerful network based not on electrical signals but on the strange bonds that form between particles of light. A beautiful dream, often confined to laboratories filled with expensive, fragile equipment.

Now, however, comes news that shifts the bar from "theoretical" to "practical." A team from Heriot-Watt University in Edinburgh has not only created a working prototype, but has done something no one has ever done before: they connected two separate quantum networks , making them operate as a single eight-user system. The experiment was the subject of an article in Nature .

The most surprising thing? They didn't use prohibitively expensive, futuristic chips, but rather common commercial optical fiber.

From Chaos to Order: The Genius of the Approach

Typically, building quantum computers or networks requires incredibly expensive custom hardware. The Scottish team instead took a pragmatic, almost "industrial" approach.

At the heart of their prototype is a multimode optical fibre that costs less than £100.

The historical problem with these fibers is that light, passing through them, bounces back in a chaotic way (scattering), creating disorder.

• The winning idea: Instead of fighting this chaos, the researchers “harnessed” it.

• The result: They programmed the fiber to transform that internal mess into a reconfigurable entanglement router .

Essentially, they've created a device that can distribute entanglement (quantum correlation at a distance) between different users, changing its configuration at will. As Dr. Natalia Herrera Valencia , lead author of the study, explains, they've transformed "internal disorder into a powerful high-dimensional optical circuit."

Why it's important news (also economically)

It's not just about physics, but about strategic infrastructure. Here are the key points that make this discovery relevant for the technological and economic future:

• Interconnection: Until yesterday, it was possible to create a single network. Today, it has been demonstrated that networks can communicate with each other . It's the difference between having a LAN in the office and having the Internet: it opens countless communication doors.

• Multiplexed Teleportation: The system managed to simultaneously exchange entanglement between four distant users on two channels. In telecommunications terms, it's like switching from a single-lane road to a multi-lane highway.

• Scalability: If we can connect many small processors via this network to make a powerful quantum computer (instead of building one gigantic, unstable one), the path to commercial application is dramatically shortened.

Here's a quick comparison between the traditional and Heriot-Watt approaches:

Characteristic	Traditional Approach	Heriot-Watt approach
Hardware	Expensive and custom photonic chips	Commercial fiber optics (< €120)
Light Management	Requires strict control, fears noise	Use “chaos” as a programmable resource
Connectivity	Single isolated local network	Two interconnected networks (Routing)
Application	Pure research	Towards scalable infrastructure

The UK's strategy

We cannot ignore the political and economic context. This research did not arise out of nowhere, but is the fruit of the Integrated Quantum Networks (IQN ) Hub , a consortium funded with 22 million pounds by the British government and industrial partners.

While in Europe we often get lost in regulatory discussions, the UK is moving straight to the strategic goal: having the most advanced quantum network in the world by 2035. It is a classic example of government intervention aimed at creating a technological competitive advantage (what we would once have called sound industrial policy).

Teleporting entanglement is no longer science fiction: it's engineering. And whoever standardizes this engineering first will dictate the rules of cybersecurity and distributed computing for decades to come.

Questions and Answers

What exactly is “entanglement teleportation”?

We're not talking about teleporting physical objects, Star Trek-style. This involves transferring the quantum state of one particle to another, instantly, thanks to the phenomenon of entanglement. In this experiment, information (the quantum state) is moved from one node of the network to another without the particle physically traveling across the channel at the time of transfer. It's the basis for absolutely unbreakable communications.

Why is using a cheap fiber so revolutionary?

Cost and complexity are the main obstacles to quantum technology.4 Integrated photonic chips are difficult to produce and scale. Using commercial optical fiber, exploiting its natural behavior (light scattering) to route signals, would reduce entry costs and simplify integration with existing telecommunications infrastructure (the fibers that run under our streets).

What is a quantum network actually used for?

Beyond cryptographic security (impossible to hack without altering the message), the “killer application” is distributed computing. Current quantum computers are small and unstable.5 By connecting many small quantum processors via a network like this, a “distributed quantum supercomputer” could be created, capable of calculations currently impossible for the discovery of drugs, new materials, and complex financial models.

The article Quantum Internet: the leap forward comes from a “trivial” 120 euro optical fiber comes from Scenari Economici .

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This is a machine translation of a post published on Scenari Economici at the URL https://scenarieconomici.it/internet-quantistica-il-balzo-in-avanti-arriva-da-una-banale-fibra-ottica-da-120-euro/ on Tue, 02 Dec 2025 19:06:46 +0000.