Breakthrough in quantum network: triple entanglement of remote atomic qubits achieved for the first time
The world of quantum computing has taken a significant step forward. My analytical team has recorded an event that could fundamentally change the approach to building quantum computers. For the first time, researchers have managed to create and confirm three-way quantum entanglement between three spatially separated atomic qubits, united into a single network.
The key achievement was the realization of the so-called Greenberger-Horne-Zeilinger state (GHZ state) between three remote nodes connected by photonic channels. This is not just another laboratory experiment — it is a demonstration that the modular architecture of quantum systems based on individual atoms can operate at a fundamentally new level.
Until now, entanglement between two nodes had already been mastered, and three-node networks had been created on other physical platforms. However, for individual atomic qubits, which can be independently controlled and scaled, such a result has been achieved for the first time.
Why this is a turning point
The main headache of the quantum industry is scaling. Creating one giant quantum processor with thousands of qubits is incredibly difficult due to noise and errors. The alternative is a modular approach: connecting many small quantum processors into a network using photons as "quantum wires." The new experiment clearly demonstrates the viability of this concept.
During the work, the fidelity of the entangled state was achieved at the level of 84–88%. Moreover, scientists managed to close the "detection loophole" for a fully distributed multi-component quantum state for the first time. The results also confirmed the violation of the Mermin inequality — a rigorous test confirming the presence of genuine quantum correlations, rather than classical ones.
A look into the future
This is a direct continuation of a series of works on photonic quantum connections. Previously, entanglement between two ionic systems was demonstrated; now the architecture has been expanded to three full-fledged nodes. Although commercial application is still far off, such experiments are the foundation for future distributed quantum computers, secure communication networks, and, ultimately, the quantum internet.
My expert opinion: This result is not just a scientific sensation. It shows that the industry is moving from theoretical research to engineering solutions. Modularity is the only realistic path to scalable quantum systems, and each such step brings us closer to an era where quantum networks will become as real as the classical internet.