Researchers at Austria's University of Innsbruck transmitted quantum information with a quantum repeater node operating at telecommunication networks' standard frequency.
The repeater node features two calcium ions contained in an ion trap within an optical resonator, and single-photon conversion to the standard telecom wavelength.
The researchers were able to transmit quantum information over a 50-kilometer (31-mile)-long optical fiber, with the quantum repeater positioned halfway between the transmission and reception points.
The researchers said they already have calculated the design upgrades that will be required to transfer data across distances of 800 kilometers (nearly 500 miles).
From Universitat Innsbruck (Austria)
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