Quantum entanglement of three remote atoms: a breakthrough in the creation of distributed quantum networks
A scientific group from Duke University, in collaboration with IonQ, has achieved a landmark result: for the first time in the world, a fully distributed three-node quantum network based on individual atomic qubits has been created. This is not just another laboratory experiment—it is a fundamental step toward the architecture of the future quantum internet.
Specialists managed to form a so-called three-party entangled state (Greenberger–Horne–Zeilinger state) between three remote quantum nodes connected by photonic channels. Previously, such configurations were demonstrated on other physical platforms, but for individual atomic qubits—units that can be independently controlled and read out—this has been done for the first time.
Why This Changes the Game
The main problem in quantum computing is scaling. Building a single large quantum processor with zero error rate is practically impossible. The solution is a modular architecture: instead of a giant computer, a network of many quantum nodes connected by photons is created. This approach resembles the evolution of the classical internet, where computing resources are distributed across thousands of servers.
The new experiment is a direct demonstration of the viability of this concept. Researchers showed that individual atomic memories can form a shared quantum state through photonic connections while maintaining high operational accuracy. The fidelity of the entangled state was 84–88%. Additionally, for the first time, they managed to close the so-called "detection loophole" for a fully distributed multi-component quantum state. The results also confirmed the violation of the Mermin inequality—one of the key tests proving the presence of genuine quantum correlations.
A Step Toward the Quantum Internet
This work continues a series of IonQ studies on photonic quantum connections. Previously, the company demonstrated entanglement between two remote ion systems, and now the architecture has been expanded to three full nodes. Although the technology is still far from commercial application, such experiments are the building blocks of future distributed quantum computers, secure communication networks, and, ultimately, the quantum internet.
My view as an analyst: This result is not just a scientific sensation but a clear signal to the market. Modular architecture is likely to become the dominant paradigm in quantum computing, and IonQ is strengthening its position as one of the leaders in this race. For investors and developers, this means that betting on photonic connections and distributed systems could pay off sooner than many expect.