For the first time in history: scientists have created a three-node quantum network using individual atoms — a breakthrough toward the quantum internet
The world of quantum technologies has just crossed an important milestone. A research team combining efforts from Duke University and IonQ has announced the creation of the world's first fully distributed three-node quantum network based on individual atomic qubits. This is not just a laboratory curiosity—it is a fundamental step toward the architecture of the future quantum internet.
The Essence of the Experiment
The key achievement is the formation of the so-called Greenberger-Horne-Zeilinger (GHZ) state between three remote quantum nodes. These nodes were connected via photonic channels, allowing atomic qubits to exchange quantum information over a distance. Until now, scientists could only entangle pairs of remote qubits, and three-node networks had only been demonstrated on other physical platforms. Now, for the first time, this has been achieved on a platform that allows independent control, readout, and, critically, scaling of each atomic qubit.
Why This Is a Turning Point
The main pain point of modern quantum computers is scaling. Building one giant error-free quantum processor is practically impossible due to physical limitations. That is why the industry is betting on a modular architecture: instead of a single monolithic chip, a network of many quantum nodes is created. This approach resembles the evolution of the classical internet, where computing power is distributed across servers.
In the experiment, the researchers achieved a fidelity of the entangled state at the level of 84–88%. Moreover, for the first time, they managed to close the so-called "detection loophole" for a fully distributed multi-component quantum state. Additionally, the results confirmed the violation of the Mermin inequality—a rigorous test that proves the presence of genuine quantum correlations rather than classical statistical artifacts.
What This Means for the Industry
This work continues a series of ambitious IonQ projects in the field of photonic quantum connections. Previously, the company demonstrated entanglement between two remote ion systems, and now the architecture has been expanded to three full nodes. This is a direct path to creating distributed quantum computers, secure communication networks, and, ultimately, the quantum internet.
My view: This experiment is not just a demonstration of capabilities, but proof that modular quantum architecture works. When we talk about the quantum internet, we often run into the problem of the "quantum repeater"—a device capable of transmitting entanglement over long distances without loss. Creating a three-node network with high precision is the first step toward solving this problem. If IonQ and Duke University continue at the same pace, we could see the first commercial prototypes of distributed quantum systems within the next 5–7 years.