Researchers have, for the first time, succeeded in linking two independent quantum networks—an achievement that not only enables new ways of distributing entanglement, but also allows one network to directly communicate with another. The team describes this as a pivotal step toward building a practical quantum internet.

Figure 1. Quantum Networks Connect for the First Time to Teleport Entanglement.

Surprisingly, the Heriot-Watt prototype doesn’t rely on a specialized quantum chip but instead uses an off-the-shelf optical fiber costing under £100. By exploiting the chaotic scattering of light within the fiber’s hundreds of internal pathways, the researchers were able to program a reconfigurable entanglement router. Figure 1 shows Quantum Networks Connect for the First Time to Teleport Entanglement

“Light normally scatters unpredictably through these pathways, but we were able to turn that chaos into a useful resource,” explained lead author Dr. Natalia Herrera Valencia.

Their resulting device can dynamically route quantum entanglement in multiple configurations—local, global, or mixed—between different users. Just as importantly, it supports multiplexing, allowing many users to share the same fiber at once, mirroring classical telecom systems but in the quantum domain.

The researchers demonstrated something unprecedented: multiplexed entanglement teleportation, successfully swapping entanglement between four remote users across two channels at the same time. While earlier experiments have achieved entanglement teleportation, none have done so across multiple simultaneous users within such an adaptable network design.

Dr. Natalia Herrera Valencia explained, “By shaping the light at the fiber’s input, we essentially programmed the fiber itself, turning its internal scattering—normally chaotic—into a powerful, high-dimensional optical circuit. That capability lets us direct entanglement wherever we need it, even teleport it, all through an ordinary-looking piece of fiber.”

A leap forward for quantum computing

Professor Malik emphasized the broader significance for quantum computing. “This is incredibly exciting. Quantum computing could transform everything from drug discovery to advanced battery materials to the future of machine learning. One of the most promising paths to building a large-scale quantum computer is to interconnect many smaller quantum processors.”

“Our prototype provides exactly that: a flexible network capable of distributing and swapping entanglement among multiple users—or quantum processors. It may be the breakthrough quantum computing has been waiting for. Yes, it’s currently a lab-scale system, but the underlying principle can absolutely be scaled up.”

Linking Quantum Networks for the First Time

Scientists have successfully connected two separate quantum networks and teleported entanglement between them—something never achieved before. This breakthrough means that, for the first time, independent quantum systems can “talk” to each other through shared quantum states, laying the foundation for a functional quantum internet.

Turning Light’s Chaos into a Quantum Tool

Instead of relying on expensive quantum chips, the team used an ordinary optical fiber costing less than £100. The chaotic scattering of light within the fiber, normally a problem, was intentionally shaped and programmed to create a reconfigurable entanglement router capable of directing quantum information along different pathways.

Multiplexed Entanglement Teleportation

The highlight of the experiment was teleporting entanglement across four distant users simultaneously, spread across two channels. Previous teleportation experiments involved fewer users and lacked this level of network flexibility. By programming the fiber, the team converted randomness into a high-dimensional optical circuit that could dynamically route or teleport entanglement.

A Flexible Quantum Network for Many Users

The system can switch between local, global, and mixed network configurations while serving multiple users at once. This multiplexing ability mirrors classical telecom networks but operates in the quantum regime—allowing many streams of entanglement to travel through the same fiber without interference.

A Potential Breakthrough for Quantum Computing

Researchers say this technology could accelerate the development of large-scale quantum computers. By linking many smaller quantum processors through a flexible entanglement-sharing network, scientists could assemble powerful distributed quantum machines. Though currently demonstrated at lab scale, the approach is scalable and may mark a major step toward real-world quantum computing and the quantum internet.

Source: SciTECHDaily

Cite this article:

Priyadharshini S (2025), Scientists Achieve First-Ever Entanglement Teleportation Between Connected Quantum Networks, pp.253