Nonlinear Crystal (IMAGE)

U.S. Army Research Laboratory

Nonlinear Crystal

Caption

Researchers at the University of Innsbruck, funded by the US Army, achieved a record for the transfer of quantum entanglement between matter and light -- a distance of 50 kilometers was covered using fiber optic cables. Researchers said this brings the quantum internet a step closer. In a nonlinear crystal illuminated by a strong laser the photon wavelength was converted to the optimal value for long-distance travel.

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Courtesy IQOQI Innsbruck/Harald Ritsch

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