The phrase “quantum internet” makes it easy to picture something completely new. A second global network, built alongside the one we already use, carrying quantum information instead of ordinary data. It sounds futuristic because, for the most part, quantum networking still is. But the infrastructure taking shape looks less dramatic than the name suggests.
Rather than replacing today’s telecom infrastructure, researchers and network operators are increasingly looking at how quantum communication can fit around it. Existing fibre can carry some of the traffic. Conventional networks can still handle control and management. Even the wavelengths used by quantum hardware are beginning to move closer to those telecom networks already support.
So how much of tomorrow’s quantum network could reuse the infrastructure carrying today’s internet? Potentially quite a lot. The harder part is understanding what “reuse” really means. Running a quantum signal through an optical fibre is one problem.
Building a scalable quantum network that can share infrastructure, connect different technologies and operate like a network rather than a laboratory experiment is something else entirely.
Existing Fibre Changes The Quantum Networking Equation
Fibre is one of the most expensive and difficult parts of any large communications network to replace. The cables themselves are only part of it. Operators already have routes, ducts, exchanges, equipment sites and operational processes wrapped around enormous fibre estates. That makes existing infrastructure an obvious starting point for quantum networking.
And increasingly, there’s evidence that it can work under conditions that look much more like a live telecom environment than a controlled physics experiment. In February 2026, Deutsche Telekom and Qunnect demonstrated quantum teleportation across 30 kilometres of commercial fibre in Berlin.
The trial ran alongside classical traffic and achieved an average teleportation fidelity of 90 per cent. More importantly from an infrastructure perspective, the equipment was installed in an operator-run network using commercially available quantum hardware. NIST pushed the same question from a different direction in August.
Its researchers sent entangled photons across 62 kilometres of commercial fibre between Gaithersburg and the University of Maryland. Much of that fibre was aerial, exposing it to the temperature changes and environmental instability that real networks have to absorb. None of this means an existing telecom network can simply become a quantum one.
But it changes the starting point. If operators can reuse large parts of the physical fibre estate, scaling becomes less about building a completely separate communications system and more about deciding what has to be added, adapted or replaced. And the fibre itself may turn out to be the easy part.
Quantum Hardware Is Learning To Speak Telecom
Optical networks aren’t neutral pipes. They’ve been engineered around wavelengths where fibre can carry light efficiently over long distances. For conventional telecom networks, the region around 1550 nanometres is particularly useful because transmission losses are low. Quantum hardware hasn’t always worked naturally in the same range.
A quantum node may produce photons at wavelengths suited to the physics inside the device, but poorly suited to travelling through kilometres of telecom fibre. There are two obvious ways around that problem. Either build quantum devices that work directly at telecom wavelengths, or translate their photons into a wavelength that existing networks handle better.
Both approaches are moving forward. A peer-reviewed study published in Nature Communications on 2 September demonstrated a spin-photon interface using quantum dots that emit at 1.55 micrometres, directly within the telecom C-band. The researchers describe telecom-range operation as important because it allows quantum matter systems to interface more naturally with long-distance optical communications.
Another study published in npj Quantum Information in March took the translation route. Researchers built a compact, fibre-integrated quantum frequency conversion system that converted photons from 637.2 nanometres to 1588.3 nanometres, moving them into the low-loss telecom window.
Their modelling suggested the converted photons could maintain entanglement fidelity above 52 per cent after 100 kilometres of fibre transmission under the conditions tested. The direction is more interesting than either result alone.
Instead of expecting telecom infrastructure to adapt around whatever quantum hardware produces, researchers are increasingly engineering interfaces around the networks those devices may eventually have to join. But fitting onto telecom fibre still isn’t the same as sharing it.
Sharing Fibre Is Harder Than Using Fibre
A dedicated fibre link gives quantum traffic a relatively clean environment. Commercial networks don’t usually have that luxury. Their fibre is already carrying huge volumes of ordinary data, which means quantum signals may eventually have to operate alongside far stronger classical signals without being drowned out by noise.
That distinction changes the economics of quantum-classical coexistence. If quantum services need their own dark fibre across every route, operators may be able to deploy them in selected locations, but widespread expansion becomes much harder. If they can share existing capacity, the infrastructure case starts looking very different.
Researchers are already testing how far that sharing can go. At the Optical Fiber Communication Conference in March 2026, a team including China Telecom Research Institute demonstrated quantum key distribution, or QKD, alongside 374.4 terabits per second of classical communication across 100 kilometres of seven-core fibre.
The system maintained a secure quantum key rate of around four kilobits per second. QKD isn’t the same thing as a full quantum internet. It uses quantum properties to distribute cryptographic keys, while more advanced quantum networks would need to distribute entanglement and quantum states between different systems.
But these coexistence experiments still answer an important infrastructure question: can very weak quantum signals survive while the same physical network is doing ordinary telecom work? Increasingly, the answer appears to be yes, under the right conditions. That moves infrastructure reuse beyond simply finding spare fibre.
It becomes a problem of managing wavelengths, interference and capacity well enough for classical and quantum communications to live side by side. There are still parts of the network where coexistence alone can’t solve the problem.
Some Parts Of The Network Can’t Stay Classical
Traditional telecom networks have a useful trick when signals weaken. They can amplify or regenerate them along the route, effectively refreshing the information before sending it onwards. Quantum information doesn’t play by the same rules. An unknown quantum state can’t simply be copied because of the no-cloning theorem, one of the basic principles of quantum mechanics.
Measuring that state can also destroy the very quantum properties the network is trying to preserve. That creates a hard boundary around how much existing infrastructure can do. Long-distance, entanglement-based quantum network architecture will need quantum-specific components.
Quantum memories can hold fragile quantum states long enough for network operations to take place. Quantum repeaters are being developed to extend entanglement across distances where direct transmission becomes impractical. Switching and routing will also have to account for resources that behave very differently from ordinary packets.
This is why the simplest version of the “reuse telecom infrastructure” argument falls apart. Quantum networks can use existing fibre and may reuse parts of the surrounding operational stack, but some capabilities have no classical equivalent. The likely transition is therefore hybrid rather than wholesale.
Existing infrastructure remains where physics allows it. New quantum infrastructure appears where it doesn’t. Once that happens, another problem emerges. Those new components also have to work with each other.
Interoperability May Be The Real Scaling Test
A successful point-to-point quantum link is still only a link. Networks become useful at scale when different endpoints, technologies and domains can communicate without every connection being engineered as its own special case. Quantum systems currently make that difficult. Different hardware platforms can produce photons at different wavelengths or encode quantum information in different ways.
Separate vendors may also build their systems around different assumptions about switching, control and entanglement distribution. That makes quantum network interoperability much more than a standards problem to solve later. It may determine whether individually impressive technologies can ever become shared infrastructure.
Cisco offered an early example of what that could look like in April when it announced a research prototype called the Universal Quantum Switch. According to Cisco, the room-temperature device is designed to connect systems from different vendors over standard telecom fibre and translate between different quantum encoding methods.
Its proof-of-concept tests showed average degradation of no more than four per cent in encoding and entanglement fidelity, although Cisco’s full research findings are still awaiting separate publication. The bigger signal comes from standards work.
The International Telecommunication Union’s technical guidance now covers quantum repeaters, switches, routers, addressing, control, management and migration from QKD networks towards more capable entanglement-assisted networks. It also argues that quantum networking will need a layered architecture, much as classical networking did before it.
Distance records will keep attracting attention. But once individual links work, scalability starts depending on something less spectacular: whether different parts of the network can work together predictably. And not all of those parts will be quantum.
Quantum Networks Will Still Depend On Classical Networks
There’s a strange contradiction at the heart of the quantum internet. The more capable the quantum layer becomes, the more obvious its dependence on conventional networking may become too. Quantum states can carry the information or entanglement that makes quantum networking unique. They can’t handle every job required to operate the network around them.
The ITU is explicit about this. Its current technical model says conventional digital networks remain essential for control and signalling, timing and synchronisation, error-correction feedback, management, orchestration and application integration. Classical addressing also remains necessary alongside quantum-specific identifiers.
Timing offers a good example of why. Quantum operations often depend on events happening within extremely narrow windows. Yet differences between the wavelengths travelling through a fibre can introduce tiny variations in delay, which become significant when the clocks at either end need to stay closely aligned.
A 2026 study in Science China Physics, Mechanics & Astronomy tested a new quantum two-way time-transfer method across 113 kilometres of fibre. When the wavelength difference reached 4.64 nanometres, conventional quantum time transfer accumulated a time offset of 164.35 picoseconds.
The alternative approach tested by the researchers held that drift to 0.07 picoseconds under the same conditions. The numbers are tiny because the problem is tiny. But scalable networks are built from thousands of details like this. Reliable quantum communication will need the same disciplines familiar to telecom operators today: synchronisation, control, monitoring, fault management and orchestration.
The quantum-classical network is therefore beginning to look less like an interim compromise and more like the architecture itself.
What Telecom Integration Changes For Enterprise Quantum Strategy
Most enterprises don’t need to start designing quantum networks. The more useful shift is in how technology leaders judge progress. For years, quantum announcements have been dominated by records. Greater distance. Better fidelity. Longer coherence. More qubits. Those achievements still count, but they don’t always tell an enterprise leader whether the underlying technology is becoming easier to deploy.
Infrastructure compatibility offers another lens. A breakthrough that lets quantum hardware work at standard telecom wavelengths removes an integration problem. Reliable coexistence with classical traffic reduces the need for dedicated capacity. Interoperable switching could reduce dependence on one hardware architecture.
Standards for control and management make multi-vendor infrastructure more plausible. Those may be stronger indicators of quantum network adoption than another isolated laboratory record. Telecom operators also start looking less like passive fibre providers under this model.
They already know how to manage geographically distributed infrastructure, maintain service quality across imperfect physical networks and coordinate equipment from multiple suppliers. If quantum networks grow through existing infrastructure, that operational experience becomes part of the value chain.
Operators themselves are beginning to prepare for a wider quantum role. A GSMA Intelligence survey of 100 network strategy and procurement decision-makers, conducted in late 2025, found that 60 per cent of operators surveyed had quantum technologies somewhere on their roadmap.
Among the whole sample, 12 per cent had deployed or planned deployment within a year, 33 per cent were looking at the following two to three years and 21 per cent at four to five years. The survey covered quantum technologies broadly, not quantum networking alone, so it shouldn't be read as a deployment forecast for the quantum internet.
Even so, it points to an infrastructure industry beginning to think beyond experiments. For enterprise leaders, this makes standards, interoperability and integration worth watching alongside the physics.
The most important change may happen gradually, as quantum capabilities become another layer within communications infrastructure rather than arriving as one clearly defined new network.
Final Thoughts: The Quantum Internet May Grow Inside The Network We Already Have
The quantum internet may eventually connect computers, sensors and other quantum systems in ways today's networks can't. But the physical and operational journey towards that future is starting to look surprisingly familiar. Existing fibre can provide part of the foundation. Telecom wavelengths can make quantum devices easier to connect.
Classical and quantum traffic may increasingly share capacity. Conventional networks can continue handling control, timing and management. Where classical technology reaches a physical limit, quantum memories, repeaters and switching will have to fill the gap.
Which means the important milestones in quantum communications infrastructure may become less dramatic as the technology gets closer to real deployment. A system fitting into an existing rack, working across an operator's fibre or interoperating with another vendor's hardware isn't as eye-catching as teleporting a quantum state across a record distance. Commercial infrastructure rarely is.
But technologies don't scale simply because they work on their own. They scale when they can be connected, managed and trusted as part of something larger. If quantum networks eventually reach global scale, their success may depend less on replacing the telecom world we already have than on learning how to speak its language.
And as that transition continues, EM360Tech will keep following the engineering and infrastructure signals that show when quantum technology is moving closer to something enterprises may genuinely have to plan around.
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