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QuTech entangles quantum nodes 10 km apart over deployed fiber

Apr 4, 2024

A QuTech-led team reports entanglement between independently operated diamond-qubit nodes 10 km apart, linked through 25 km of deployed fiber. Success signals let the nodes retain the entangled state for later use. The work appeared in Science Advances in 2024.

Why it matters

It extends links between quantum processors beyond the laboratory while delivering entanglement that can be used in subsequent network operations.

Ronald Hanson · QuTech · TU Delft

See it on the timeline

QuTech links three quantum nodes in an entanglement-based network (Feb 8, 2021)
Harvard links quantum memories through a 35 km urban fiber loop (Oct 2, 2023)

Sources (2)

arXiv (Stolk et al.; later published in Science Advances) Metropolitan-scale heralded entanglement of solid-state qubits
Primary sourceApr 4, 2024

“Here, we report on heralded entanglement between two independently operated quantum network nodes separated by 10km. The two nodes hosting diamond spin qubits are linked with a midpoint station via 25km of deployed optical fiber.”
arXiv (Stolk et al.) Metropolitan-scale heralded entanglement of solid-state qubits — usable entanglement
Primary sourceApr 4, 2024

“By capitalizing on the full heralding capabilities of the network link in combination with real-time feedback logic on the long-lived qubits, we demonstrate the delivery of a predefined entangled state on the nodes irrespective of the heralding detection pattern.”

Added Oct 28, 2026. Spotted an error? Tell us and we will review it.

QuTech entangles quantum nodes 10 km apart over deployed fiber

Why it matters

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