When the quantum future begins to take shape as a network

Gusztáv Krékity

For a long time, the main question surrounding quantum technology was who could build a larger, faster, or more stable quantum computer. The competition is spectacular: the number of qubits, error correction, computational capacity, and laboratory results. Cisco’s latest announcement, however, draws attention to a different, less high-profile but strategically just as important problem: how […]

To be honest, I’ve always been a bit skeptical about quantum networks. Lots of promises, but few real, scalable solutions. However, I think Cisco’s latest announcement points in an interesting direction. They aren’t trying to build yet another “even more powerful” quantum machine, but are targeting a fundamental problem: how these systems can work together at all.

Not another quantum computer, but network infrastructure

According to Cisco’s latest announcement, the so-called Universal Quantum Switch has been developed—a breakthrough that could bring us closer to true quantum networks.

The Cisco Universal Quantum Switch unveiled by the company is a research prototype that addresses one of the fundamental challenges of quantum networks. Today’s quantum systems can encode information in various ways—for example, using polarization, time-bin, frequency-bin, or path-based encoding. This means that systems based on different technologies are often incompatible with one another.

What’s truly exciting about this: this approach isn’t just another quantum computer, but targets the problem of interoperability. Until now, quantum systems based on different technologies have practically “not spoken to each other.” This new switch, however, is capable of converting between different encoding modes without destroying the quantum information.

The idea behind the Universal Quantum Switch—that it is possible to switch between different quantum state encodings without damaging the information—seems to me more like infrastructure building than a spectacular demonstration. And perhaps that is exactly what has been missing until now.

Why is interoperability important?

At first glance, this may seem less spectacular than yet another quantum computing performance record, yet in the long run, it may well prove to be just as important. The history of the classic internet also shows that the breakthrough was not brought about solely by the development of individual computers, but rather by the ability to connect them into a shared, scalable network.

The analogy might be likened to the dawn of the classic internet: it wasn’t individual computers that brought about the breakthrough, but rather the ability to connect them into a network.

In the case of quantum technology, we face a similar question: it’s not enough to build high-performance systems; we must also be able to connect them. If future applications—for example, in healthcare, financial services, or industrial research—truly require quantum capacities that are orders of magnitude greater, then distributed, interconnected quantum systems could represent a logical direction.

I believe this is a key point. The future of quantum computing is not (just) about the most powerful machines, but about how we build a scalable, interoperable ecosystem.

What makes Cisco's solution unique?

One of the key promises of the Universal Quantum Switch is that it would not tie the deployment of quantum networks to a single manufacturer or technology ecosystem. The goal is to enable interoperability among different quantum systems, different encoding schemes, and solutions from different vendors.

Moreover, all of this:

on a conventional optical network
at room temperature
without vendor lock-in

What I particularly like: we’re not talking about a solution tied to some extreme environment, but rather a concept operating on an optical network at room temperature. This is already closer to something that could actually be used one day.

This is not merely a technical detail. From the perspective of scalability and practical applicability, a key question is how well a quantum network element can be integrated into today’s infrastructure. For much quantum hardware, the extreme operating environment—such as cryogenic cooling—can be a significant obstacle in itself. In contrast, a concept that builds on existing optical infrastructure and operates at room temperature may be much closer to actual deployability.

What do we know about the results so far?

In Cisco’s experiments to date, the switch has already been validated to work with polarization coding, while support for time-bin and frequency-bin coding is part of the design and the next step in further validation. According to the company’s measurements, the system:

achieved switching speeds in the nanosecond range,
consumed less than 1 watt of power,
exhibited an average degradation of no more than 4 percent in quantum state fidelity and entanglement during conversion.

These are promising results, but it’s important to note: this is still a research prototype, not a ready-to-deploy, large-scale quantum internet. Of course, there are still plenty of questions. But if the future of quantum computing truly lies in networks (and not in isolated systems), then steps like these could be the real game-changers.

From hype to systems thinking

There has long been a great deal of anticipation surrounding quantum technology, but practical, scalable solutions often take longer to materialize than announcements suggest. The Cisco Universal Quantum Switch is therefore not merely the announcement of a new piece of hardware. Rather, it is a sign that the next big question in quantum technology may be interoperability: how do we connect different systems so that they create greater value together than they do separately?

For the first time, I feel that this isn’t just hype, but is beginning to come together as a system.

If this direction works, then in the coming years we won’t see a “quantum race,” but a competition among quantum network platforms.

In this competition, the winner won’t necessarily be the one who builds the most powerful standalone quantum machine, but the one who can create a scalable, open, and vendor-neutral quantum network platform. The quantum future may thus take shape not in isolated machines, but in networks—and this could be the point where real infrastructure begins to emerge from earlier promises.