Duke, IonQ Build 3-Node Quantum Network With 84%-88% Fidelity

2 articles · Updated · forklog.com · Jun 20

Duke University and IonQ said they created the first fully distributed three-node quantum network built from individual atomic qubits, linking three remote nodes through photonic channels.
The experiment produced a tripartite Greenberger-Horne-Zeilinger entangled state with 84%-88% fidelity, while also closing the detection loophole for a fully distributed multipartite quantum state.
Researchers said the result also violated Mermin’s inequality, reinforcing that the network generated genuine quantum correlations across independently controlled atomic memories.
The advance targets quantum computing’s scaling problem by testing a modular design—many smaller quantum nodes connected by photons instead of one large processor.
IonQ had previously shown entanglement between two remote ion systems; extending that architecture to three nodes marks another step toward distributed quantum computers and a future quantum internet.

Sources

forklog.com1d ago

Duke University, IonQ Create First Three-Node Quantum Network with Atomic Qubits

Quantum Computing Report1d ago

Duke Quantum Center, IonQ Achieve Tripartite Entanglement of Remote Atomic Qubits, Violating Mermin Inequality

With quantum modules now linked, has the main challenge shifted from qubit quality to engineering a functional 'quantum internet'?

Now that a three-node quantum network exists, what is the roadmap for scaling it to a secure, city-spanning communication system?

This breakthrough's slow entanglement rate is a major hurdle. Can this modular approach scale fast enough to beat monolithic designs?

Distributed Tripartite Entanglement Achieved: Duke and IonQ’s 97% Fidelity Quantum Network Breakthrough and the Road to a Scalable Quantum Internet

Overview

On June 20, 2026, researchers from the Duke Quantum Center and IonQ achieved a major milestone by demonstrating a Greenberger–Horne–Zeilinger (GHZ) state across a three-node quantum network using individual trapped atomic ions. This breakthrough established a new paradigm for quantum information processing by closing the detection loophole, which ensures the validity of entanglement observations, and achieving a deterministic violation of the Mermin Inequality. Together, these results provide robust evidence for the non-classical nature of the observed entanglement and mark a significant step toward scalable, distributed quantum computing.

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