Photons entangled across 52-mile in Chicago

Researchers from Argonne National Laboratory and the University of Chicago entangled photons across a 52-mile network in Chicago.

The quantum loop is among the longest land-based quantum networks in USA. Argonne plans to scale this network by developing a two-way quantum link network with UChicago-affiliated Fermi National Accelerator Laboratory. Such a link could help to lay the foundation for a national laboratory-led cross-country quantum internet.  

In achieving this milestone, the team worked closely with companies in the emerging quantum industry, like Qubitekk, a new company developing quantum technologies. Together they created entangled photon pairs and distributed them across two 26-mile fiber loops. The returning photon pairs were detected, and their correlation was verified with a high signal-to-noise ratio. (Argonne National Laboratory)

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