Researchers demonstrated a trapped-ion quantum repeater node establishing entanglement over a deployed 17 km metropolitan fiber with 81.6% Bell-state fidelity, advancing toward distributed quantum networks using existing city infrastructure.

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Entanglement Can Travel Without Travelling

Quantum networks don't need continuous links.

Entanglement swapping connects independent systems, making Bell measurements the foundation of quantum communication.

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Researchers demonstrate integrated photonic quantum repeater using tin vacancy centers with spectral tuning, coherent spin control, and fiber coupling—advancing scalable quantum networking architecture.

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Barcelona startup Arq Quantum achieved first transmission of light-matter entanglement over tens of km in metro fiber, advancing practical quantum repeater technology for long-distance quantum communication networks.

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