Breakthrough in quantum networks: three-party entanglement created on individual atomic qubits for the first time
The quantum industry is taking a significant step toward distributed computing. Researchers from Duke University, in collaboration with IonQ, have for the first time demonstrated the creation of a fully distributed three-node quantum network based on individual atomic qubits. The key result is the formation of a three-party entangled state (GHZ state) between three remote nodes connected via photonic channels.
What This Means for Quantum Technologies
Quantum entanglement is a phenomenon where a change in the state of one particle instantly affects others, regardless of distance. This property is the foundation for future quantum networks and the so-called "quantum internet." Previously, scientists have demonstrated entanglement between two nodes and created three-node networks on other physical platforms, but not on individual atoms. Now, for the first time, this result has been achieved with atomic qubits that can be independently controlled, read out, and scaled to build computing systems.
Key Experiment Metrics
The main challenge for quantum computers is scaling. Building a single massive quantum processor is incredibly difficult due to errors and hardware limitations. Therefore, developers are increasingly betting on a modular architecture: instead of a monolithic computer, a network of many quantum nodes connected by photons is created. This mirrors the evolution of the classical internet.
The new experiment is a direct step in this direction. Researchers showed that individual atomic memories can form a shared quantum state through photonic connections with high precision. During tests, the fidelity of the entangled state was 84–88%. Moreover, the team for the first time managed to close the so-called "detection loophole" for a fully distributed multi-component quantum state and confirmed the violation of the Mermin inequality, one of the key tests for genuine quantum correlations.
The Path to the Quantum Internet
This work continues a series of IonQ studies on photonic 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 implementation, such experiments are important building blocks for future distributed quantum computers, secure communication networks, and the quantum internet.
My comment: This experiment is not just a scientific sensation but a practical step toward solving the scaling problem that hinders the development of quantum computing. If the modular approach proves viable, we could see the first hybrid quantum-classical networks within the next decade, fundamentally changing the market for high-performance computing and cryptography.