Photons entangled across 52-mile in Chicago

University of Chicago and Argonne scientist David Awschalom (center) discusses quantum entanglement with Department of Energy Under Secretary for Science Paul Dabbar (second from the left) and other laboratory, DOE and University leaders and researchers.

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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