Researchers at the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory and Stony Brook University (SUNY) have demonstrated the first permanent free-space optical (FSO) quantum link in the United States. Operating between Stony Brook’s Quantum Watchtower and Brookhaven’s Quantum Lighthouse, the team transmitted single photons and entangled photon pairs through 13 miles (21 kilometers) of open atmosphere, adding a “wireless” leg to the nation’s longest metropolitan quantum network.
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