The world's first three-node quantum network using atomic qubits: a breakthrough towards the quantum internet
Specialists from Duke University and IonQ have achieved a historic breakthrough, creating for the first time in the world a fully distributed three-node quantum network based on individual atomic qubits. During the experiment, they successfully formed a three-party entangled state (GHZ state) between three remote quantum nodes connected by photonic channels.
What happened
Quantum entanglement is a fundamental phenomenon where multiple particles remain connected regardless of distance. A change in the state of one instantly affects the others, making this effect key for future quantum networks and the quantum internet. Previously, entanglement was demonstrated between two nodes, as well as on other physical platforms, but this is the first time such a result has been achieved for individual atomic qubits that can be independently controlled, read out, and scaled to build computing systems.
Why this matters
The main challenge of quantum computers is scaling. Creating a single large quantum processor is incredibly difficult due to errors and hardware limitations. Therefore, many developers are betting on a modular architecture: instead of one giant computer, a network of many quantum nodes connected by photons is built. This approach resembles the evolution of the classical internet, where resources are distributed across many servers.
The new experiment is a direct step in this direction. The researchers proved that individual atomic memories can form a shared quantum state through photonic connections while maintaining high operational fidelity. During the experiment, the fidelity of the entangled state was 84–88%, and for the first time, the so-called "detection loophole" was closed for a fully distributed multi-component quantum state. The results also confirmed the violation of the Mermin inequality — one of the key tests for genuine quantum correlations.
A step towards the quantum internet
The work continues a series of IonQ studies on photonic quantum connections. Previously, the company demonstrated entanglement between two ion systems, and now it has expanded the architecture to three full nodes. Although the technology is far from commercial application, such experiments are crucial building blocks for future distributed quantum computers, secure communication networks, and the quantum internet.
My analysis: This result is not just a scientific curiosity but a critical step towards the practical implementation of quantum networks. The successful creation of a three-node system on atomic qubits proves that the modular approach is scalable and viable. If the pace of progress continues, we could see the first prototypes of distributed quantum computers capable of solving problems inaccessible to classical systems within the next 5–7 years.