Quantum entanglement has been achieved for the first time between three remote atomic qubits — a breakthrough toward scalable networks
The quantum computing community has achieved a historic milestone: researchers from Duke University and IonQ have, for the first time, created a fully distributed three-node quantum network based on individual atomic qubits. This is not just another laboratory experiment — it is a direct step toward modular quantum computers and the future quantum internet.
Achievement: Three-party entanglement with high fidelity
The specialists managed to form the so-called Greenberger-Horne-Zeilinger (GHZ) state — a three-party quantum entanglement between three remote nodes connected via photonic channels. The key difference of this work from previous ones is that it was performed on individual atomic qubits, which can be independently controlled, read out, and, critically, scaled to build computing systems.
Why this changes the game
Until now, quantum entanglement between two remote nodes has been demonstrated repeatedly, and three-node networks have existed on other physical platforms (e.g., photons or superconductors). However, atomic qubits used in ion traps are considered among the most promising for creating reliable quantum processors due to their long coherence times and high operation fidelity.
The main problem with modern quantum computers is scaling. Building a single giant processor with thousands of qubits is extremely difficult due to error accumulation and 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 connected by photons is created. This resembles the evolution of the classical internet, where computing resources are distributed across servers.
In the experiment, the scientists achieved a fidelity of the entangled state at the level of 84–88%. Additionally, they closed the so-called "detection loophole" for a fully distributed multi-component quantum state for the first time. The results also confirmed the violation of the Mermin inequality — one of the key tests proving the presence of genuine quantum correlations rather than classical ones.
Path to the quantum internet
This work continues a series of IonQ studies in photonic quantum connections. Previously, the company demonstrated entanglement between two remote ion systems, and now it has expanded the architecture to three full nodes. Although the technology is still far from commercial application, such experiments are fundamental building blocks for future distributed quantum computers, secure communication networks, and, ultimately, the quantum internet.
My analysis: This result is not just a scientific sensation but a clear signal to the market. IonQ and other leaders in ion traps are proving that the modular approach to quantum computing is viable. If the pace of progress continues, we could see the first commercially significant distributed quantum systems within 5–7 years, which will radically change the landscape of cryptography and high-performance computing.