Breakthrough in quantum networks: three remote atomic qubits entangled for the first time
The world of quantum computing stands on the brink of a new era. A research team, combining efforts from Duke University and IonQ, has unveiled the world's first fully distributed three-node quantum network built on individual atomic qubits. This is not just a laboratory curiosity, but a fundamental step toward creating a scalable quantum internet.
The key achievement is the successful formation of the so-called Greenberger-Horne-Zeilinger (GHZ) state among three remote quantum nodes. Unlike classical bits, qubits in such a state are "entangled": a change in one instantly affects all others, regardless of distance. Previously, similar networks were demonstrated on other physical platforms, but for controlled atomic qubits, this experiment is the first of its kind.
Why This Changes the Game
The main problem with modern quantum computers is scaling. Building one giant quantum processor with millions of qubits is practically impossible due to error accumulation and physical limitations. The alternative is a modular architecture, where instead of a monolithic chip, a network of many quantum nodes connected by photonic channels is created. This mirrors the evolution of the classical internet: from mainframes to a distributed network of servers.
During the experiment, scientists demonstrated that individual atomic memories can form a shared quantum state through photonic connections while maintaining impressive operational accuracy. The fidelity of the entangled state was 84–88%. Moreover, the researchers closed the so-called "detection loophole" for a fully distributed multi-component quantum state for the first time, and the results confirmed the violation of the Mermin inequality — a key test for the authenticity of quantum correlations.
A Step Toward the Quantum Internet
This work continues IonQ's line of research in photonic quantum connections. Previously, the company demonstrated entanglement between two remote ion systems, but expanding the architecture to three full-fledged nodes is a qualitative leap. The technology is certainly far from commercial application, but such experiments are the building blocks for future distributed quantum computers, secure communication networks, and, ultimately, the quantum internet.
Cryptalist Analysis: This result is not just a scientific sensation, but a clear signal to the market. The modular approach to quantum computing is becoming the dominant trend. Investors and developers should closely watch companies that bet on photonic connections and distributed architectures, rather than increasing the number of qubits in a single chip. This is likely where the next major breakthrough will occur.