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NIST researchers successfully transmitted entangled photons over 62 km of existing fiber infrastructure using real-time polarization stabilization, validating a critical path toward practical quantum networks. This achievement demonstrates that current telecommunications cables can be leveraged for long-distance quantum communication without requiring entirely new physical installations. The high fidelity maintained during the test period suggests significant potential for future applications in secure communications and distributed quantum sensing.

Sources coveringThe Quantum Insider, Quantum Computing Report, Quantum Zeitgeist

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NIST Researchers Demonstrate Entangled Photon Transmission Over Existing Fiber Networks

The Quantum InsiderAugust 6, 20266 min read

Insider Brief In early 2025, special signals wended their way through a fiber-optic highway strung above the streets and sidewalks of the Maryland suburbs. The arrival of those signals at their destination marks a significant step toward a long-held dream of building a “quantum network.” Researchers believe that this emerging technology could someday link quantum […]

NIST researchers and collaborators demonstrated the transmission of entangled photons through 62 kilometers of existing above-ground fiber infrastructure, supporting research into practical quantum networks. The team used real-time polarization stabilization technology developed by Qunnect to maintain photon entanglement despite environmental disturbances affecting the fiber. The experiment distributed entangled photons at a rate of 1,500 per second and maintained entanglement for 92.8% of a 24-hour test period. This article is based on reporting and material published by the National Institute of Standards and Technology (NIST). In early 2025, special signals wended their way through a fiber-optic highway strung above the streets and sidewalks of the…

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