The race toward quantum internet: absolute security, new protocols, and pilots underway

The next major digital infrastructure won’t just be faster—it will be much harder to spy on. While public debate remains focused on artificial intelligence and 5G, governments, banks, and operators are working on a silent but decisive technology: the so-called quantum internet. This network doesn’t aim to replace the current one but to add a new layer of security and trust based on the laws of quantum physics.

In practice, the quantum internet relies on phenomena such as entanglement and quantum key distribution (QKD) to create communication channels where any espionage attempt leaves a trace. That’s why the first interested parties aren’t consumers but defense, banking, energy, critical infrastructure, and intelligence agencies. In a context of geopolitical tension and technological competition, control of these networks becomes another piece of the rivalry between major blocs.

What is the quantum internet really?

The term “quantum internet” doesn’t refer to a new version of the web as we know it, but to a communications infrastructure that uses quantum states of light to transmit extremely sensitive information. Instead of classical bits (0 or 1), qubits encoded in individual photons come into play, traveling through fiber optics or space links.

The key idea is that these qubits are mainly used to exchange cryptographic keys ultra-securely. The most mature technology in this field is QKD, or quantum key distribution. Two nodes generate a shared key using entangled photons or fragile quantum states; if anyone tries to intercept the communication, the quantum nature itself ensures the system detects it because the states are altered when measured.

This means the quantum internet doesn’t replace current data networks but provides an additional security layer. Traffic still travels through classical networks, but the keys protecting it are generated and distributed through quantum mechanisms, much more resistant to potential attacks, including from future quantum computers capable of breaking traditional encryption.

Advantages over current communications

Theoretically unbreakable security

The main promise of the quantum internet is that it offers a level of security unattainable with classical methods. QKD allows two parties to share keys with the physical guarantee that any interception attempt will be detected. It’s not about “stronger encryption” but about changing the rules of the game: security no longer depends solely on mathematically difficult problems but on fundamental physical principles.

Protection against future quantum attacks

The arrival of sufficiently powerful quantum computers could break some current encryption schemes. For states, banks, or companies handling information that must remain confidential for decades, this is a real issue. The quantum internet is proposed as one of the solutions: by using keys generated quantumly and continuously renewed, the risk that an attacker could store encrypted messages today and decrypt them in the future is reduced.

Critical communications with added guarantees

Quantum technology also allows for designing specific protocols for critical communications between governments, armed forces, central banks, energy operators, or infrastructure managers. It’s not just about confidentiality but also integrity and traceability in networks where a failure could have massive consequences.

Quantum internet projects already underway

Far from being a theoretical idea, the quantum internet is taking shape through pilot projects across continents. None are finished, but together they provide a fairly clear picture of where this technology is headed.

Europe: EuroQCI and the push for secure quantum communications

The European Union launched EuroQCI, a European project for quantum communications, aiming to connect member states through terrestrial and satellite quantum links. The goal is to create a secure communications network for institutions, data centers, and critical operators, complementing other strategic European infrastructure initiatives such as IRIS2.

In parallel, several European countries have launched metropolitan QKD networks between ministries, banks, and data centers, supported by operators and telecom manufacturers. The idea is to move from lab experiments to pre-commercial services in real-world environments.

United States: roadmap for a national quantum internet

The U.S. Department of Energy has published a plan to develop a quantum internet, including test corridors between labs and universities. The goal is to create a national quantum network connecting research centers, federal institutions, and major scientific infrastructures, targeting defense applications, material science, and advanced simulations.

China and other powers

China has deployed one of the world’s longest quantum links, connecting Beijing and Shanghai with thousands of kilometers of dedicated fiber and intermediate nodes capable of managing quantum keys. Japan, South Korea, and other Asian countries are also advancing metropolitan networks for banking and telecommunications.

Operators and tech companies

European telcos such as Deutsche Telekom, Telefónica, and Orange, together with QKD specialists and network equipment manufacturers, are testing commercial solutions to incorporate quantum modules into existing infrastructures. The goal is that, eventually, clients can contract “quantum-secure” communication services just as they currently contract dedicated lines or virtual private networks.

How a quantum network works in practice

Beyond the theoretical framework, a quantum network involves solving very specific engineering challenges. Photons are fragile, and the signal degrades with distance, so building large-scale networks is not trivial.

Terrestrial quantum fiber

The most direct way to deploy quantum links is using dedicated optical fiber to transmit individual photons. This works well in metropolitan environments, but practical distance is limited by fiber losses. We’re talking tens or, under controlled conditions, a few hundred kilometers before the quantum signal quality degrades too much.

Quantum satellites

To cover long distances, satellites play a central role. Through optical links between satellite and ground, it’s possible to distribute quantum keys between widely separated nodes. Europe plans to integrate this logic into its satellite architecture, alongside projects like IRIS2, while other powers have already demonstrated satellite-based QKD.

Quantum nodes and repeaters

A major line of research is developing quantum repeaters, devices capable of extending network distances without destroying quantum information. Published research in quantum networks and repeaters shows progress but remains an evolving field.

Hybrid layers: quantum plus classical

In practice, quantum networks will be deployed as an additional layer over classical fiber, radio, and satellite infrastructures. Most data will still travel as before; what changes is how encryption keys are negotiated and distributed, along with certain high-sensitivity protocols.

Applications for banking, defense, and critical systems

The first users of the quantum internet won’t be regular consumers but sectors where a security failure has an immediate impact on financial stability, territorial integrity, or continuity of essential services.

Banking and financial markets

Financial institutions handle huge volumes of transactions and sensitive data requiring decades of protection. Using QKD between headquarters, data centers, and markets can secure communications against advanced attacks and reduce the risk of massive leaks.

Defense and intelligence services

For defense ministries and security agencies, having quantum-secure links between bases, embassies, and command centers is particularly relevant. In a tech rivalry scenario, a network that detects any espionage attempt in real time is a strategic advantage.

Energy, water, transport, and critical infrastructure

Power grids, water systems, railways, ports, and airports rely on digital communications that could be targets of cyberattacks. The quantum internet offers an additional protection layer for communications between control centers and monitoring systems, in a context where the European telecom sector already assumes its role as critical infrastructure.

Health and highly sensitive data

Medical, genetic, and health research data require long-term confidentiality guarantees. Quantum-secure links between hospitals, laboratories, and supercomputing centers could play a key role in this domain.

Technical and adoption obstacles

Despite its potential, the quantum internet is still in an early stage. Several barriers explain why current deployments are pilots and not widespread infrastructures:

• Physical limitations in transmitting photons over long distances

• Lack of mature quantum repeaters for networks spanning thousands of kilometers

• High costs of specialized equipment and links

• Absence of comprehensive standards and certifications for mass commercial use

• Scarcity of specialized talent in quantum physics applied to telecommunications

Additionally, multiple actors—governments, operators, research centers, and tech providers—must be coordinated. Governance will be as important as the technology itself.

What to expect in the next five years

In the short to medium term, the quantum internet will evolve more like a network of specialized networks than a single global system. Likely developments include:

• National or regional quantum networks connecting key institutions

• Commercial QKD integration in certain banking, defense, and energy links

• Hybrid projects combining fiber and satellites for secure international links

• First “quantum-secure” services offered by operators

Europe will aim to position these quantum infrastructures alongside other initiatives like satellite constellations or sovereign cloud programs, as part of a broader strategy of technological autonomy. The U.S., China, and other actors will follow their own roadmaps, creating a scenario where communication security becomes another factor in bloc rivalries.

The average citizen will take time to notice these networks, but decisions made now will shape the level of security and control governments and companies have over their most sensitive communications in the coming decades.

Frequently Asked Questions

Will the quantum internet replace the current internet?

No. It is meant to complement existing networks by adding a security layer based on quantum principles, especially for critical communications.

Is it true that it’s impossible to hack?

No system is perfect, but quantum key distribution allows detection of interception attempts, greatly increasing security compared to classical methods.

When will it be available for ordinary companies?

In the coming years, specific services for sectors like banking, energy, or infrastructure will appear. For most SMEs, it will remain an indirect technology, integrated through their telecom providers.

Which countries are most advanced?

The European Union, United States, and China host most significant projects, with test networks and pilots underway.

Will it affect everyday internet use?

In the short term, it won’t change ordinary browsing or streaming. Its impact will be more visible in the security of communications supporting the economy and essential services.