Quantum Networks as Alternative to Classical Internet

Today, we will discuss a notable scientific development: a quantum “bridge” designed to enable quantum networks, which could eventually serve as a replacement for the conventional Internet.

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Quantum Bridge: From Science Fiction to a Global Network

Imagine massive power plants in the middle of a desert – technologically advanced and impressive, yet completely disconnected from any power grid. This is the current state of quantum computing: extraordinarily powerful and impressive, but largely isolated. The concept of a quantum internet is no longer purely science fiction, yet a significant gap remains between the idea and practical implementation – one that most people do not notice.

The field of quantum technology is rapidly approaching a point where science fiction concepts become part of everyday life. A quantum internet is beginning to take shape, but a critical component is still missing: a reliable “bridge” capable of linking powerful yet isolated quantum computers to a global quantum communication network.

This bridge is being developed by Dr. Yanan (Laura) Wang at the University of Nebraska–Lincoln. With a five-year grant of over $870,000 from the U.S. Department of Energy, her team is working on a technology that could represent a crucial step toward a global quantum network. This development is not merely a scientific achievement; it has the potential to blur the boundary between today’s reality and the future world we have yet to fully envision.

Why Quantum Computers Remain “Islands”

Public discussion around quantum technology often focuses on qubit counts, processing speed, or potential threats to current cryptography. However, there is a less obvious issue: modern quantum computers are largely unable to communicate with one another.

Contemporary quantum processors are impressive, featuring hundreds or even thousands of qubits, complex architectures, and rapid development. Yet nearly all operate as isolated, self-contained “islands.” Commercial systems are still designed for single-device operation rather than networked connectivity. This is akin to building massive power plants without installing transmission lines – without interconnections, the full potential of quantum computing remains localized.

Today’s most common superconducting qubits operate in the microwave range. They are controlled and read out using microwave photons and require ultralow temperatures of just a few millikelvins. While this setup is ideal for precise computation, it is highly unsuitable for long-distance information transfer, as microwaves attenuate rapidly in standard environments.

In contrast, long-distance quantum communication works best using visible and near-infrared light – so-called optical photons – which can be efficiently transmitted through fiber-optic cables. This is why companies like IBM and other industry leaders emphasize the need for “flying qubits.” Optical photons represent the most practical option for creating a quantum “backbone.” The challenge is that quantum computers operate in the microwave domain, while the network uses light. Without a translator, the two systems cannot directly communicate.

Quantum Bridge: A Translator Between Microwaves and Light

This is the type of “translator” being developed by Professor Wang. Her project focuses on creating integrated photon–phonon circuits – devices designed to coherently process and route quantum signals between the computational and communication components of a system.

How does it work? The key intermediary is mechanical vibrations in matter, or phonons. The photonic component handles light, while the phononic component involves mechanical resonators. Quantum information first enters the mechanical resonator (an indirect mechanical mode) and is then converted into an optical signal. This is a standard transduction scheme, as described in technical literature from IBM.

At the core of the project are Van der Waals layered crystals. Professor Wang selects these materials as some of the most promising for realizing the quantum bridge. These materials can be exfoliated down to individual atomic layers, including graphene and other ultrathin semiconductors. They are exceptionally thin yet mechanically robust. Wang even draws a parallel between the chemical structure of graphene and diamond – two different forms of the same carbon foundation.

Mechanical devices for quantum technologies require not only precision but also stability and minimal energy loss. Wang’s team will study the physics of these devices in depth, including energy dissipation pathways, phonon engineering, and topological design approaches. The goal is to ensure that the systems remain resilient even in the presence of manufacturing defects. The team is also exploring mechanical resonators and waveguides capable of interacting simultaneously with both microwave and optical signals.

This is not a single laboratory demonstration – it represents a comprehensive set of solutions suitable for integration across a variety of quantum platforms.

Scientific Depth: Stability, Losses, and Topological Protection

Simply demonstrating a “laboratory trick” is insufficient in quantum technology. Mechanical components in these systems must be highly stable, energy-efficient, and capable of operating under extreme conditions with minimal losses. For this reason, Wang’s project extends well beyond a single experimental setup and encompasses fundamental research in several key areas:

Energy loss physics in thin crystals. To prevent quantum vibrations from damping, it is essential to study how energy dissipates at the atomic level and identify methods to minimize these losses.
Phonon engineering. Controlling mechanical vibrations at micro- and nanoscale allows precise manipulation of quantum states and reduces random noise that could compromise computation.
Topological design patterns. Using specialized structures and forms enhances system resilience against manufacturing imperfections and external influences. Even if minor defects occur at the material level, the topology ensures the device continues to operate reliably.

This is not just a single device or isolated experiment – it represents a comprehensive platform of solutions that can be scaled and integrated into various quantum architectures, from superconducting to optical and hybrid systems. Wang’s project establishes a versatile foundation that could underpin future quantum networks, enabling computers to operate as a unified global system where the capabilities of each individual qubit are utilized to their fullest potential.

Why This Is Revolutionary: Quantum Internet and Modular Systems

The quantum internet is not merely a “faster Wi-Fi.” It transmits quantum states rather than classical bits, preserving superposition and entanglement. Due to the no-cloning theorem, information in such a network cannot be copied undetectably. For this reason, the U.S. Department of Energy has long identified quantum networks as one of the most critical technological frontiers of the 21st century. According to their projections, a prototype network could emerge within the next decade.

If Wang’s “bridge” succeeds, quantum computers will no longer function as monolithic systems. Instead of a single, large, and maintenance-intensive processor, it will be possible to create modular systems – linking dozens or even hundreds of smaller devices into a unified network.

Yanan Wang herself draws a clear parallel: the current developments resemble the 1990s, when the internet began transitioning from a specialized tool for researchers into a widely accessible infrastructure. At that time, computers were also “isolated islands.”

Successfully building an effective bridge between microwave-based quantum computers and optical communication would pave the way for modular quantum systems. Instead of a single, increasingly complex and expensive processor, the network would consist of multiple devices linked into a unified computational environment.

This represents a leap comparable to the transition of classical computers from standalone machines to a global network. As with that shift, the full impact of this development is difficult to predict in advance.

The Emerging Future

While the conventional internet will continue to serve everyday tasks, a new layer of connectivity is quietly beginning to take shape alongside it. Yanan (Laura) Wang’s quantum “bridge” could become the crucial missing link, enabling quantum computers to move beyond the confines of laboratories and operate collaboratively.

The quantum bridge is not merely another item on the long list of technological innovations. It represents a point of no return, because true revolutions begin not when a new machine appears, but when these machines start to interact.

This is more than a technical improvement. It marks the emergence of a new era of communication, where entanglement and quantum security form the foundation for the next generation of science, industry, and national security. Somewhere in a laboratory at the University of Nebraska–Lincoln, this quantum bridge is already beginning to take shape.

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