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US Department of Energy backs ‘quantum repeater’ development

September 3, 2019

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A set of new photonics-based research projects intended to help extend the range of quantum-encrypted networks has been backed with $13.7 million from the US Department of Energy (DOE).

Money from the Office of Advanced Scientific Computing Research, part of the DOE’s Office of Science, will support five four-year development efforts focused on so-called “quantum repeaters”.

The technology is needed because quantum encryption is based around the transmission and detection of single photons, meaning that the maximum length of a link secured by quantum phenomena – for example as polarization or phase – is severely limited by fiber-optic attenuation, even in ultra-low-loss fibers.

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