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This permanent free-space optical link successfully transmits entangled photons across 161 miles using adaptive optics to correct atmospheric turbulence, marking a critical infrastructure milestone for the US quantum internet. By bridging Brookhaven National Laboratory, Stony Brook University, and Yale University, this achievement demonstrates the viability of wireless quantum networks beyond traditional fiber-optic constraints.

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A wireless link builds the nation’s longest quantum network

Quantum ZeitgeistAugust 28, 20266 min read

A free-space optical (FSO) link spanning Brookhaven National Laboratory, Stony Brook University, and Yale University adds a wireless component to the nation’s longest quantum network. This FSO link, the first permanent one of its kind, spans 161 miles across Long Island and the New York metropolitan area.

Extending 161 miles across Long Island and the New York metropolitan area, the nation’s longest quantum network now incorporates a wireless link established by Justine Haupt of Brookhaven Lab. Haupt developed the telescope technology, specifically the mirrors, to enable the transmission of light particles containing quantum information through open air. “An FSO link is analogous to the wireless technology that allowed today’s classical internet to expand beyond wired connections,” Haupt said, marking the first permanent free-space optical link of its kind and a crucial step toward a practical quantum internet. A 13-mile stretch of open air now carries quantum information between Brookhaven National Laboratory and Stony Brook University, extending the nation’s longest quantum…

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