New quantum key system combines speed, distance

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Detection stage of the NIST prototype quantum key distribution system: Photons are up-converted from 1310 to 710 nm by one of the two NIST-designed converters at right then sent to one of two commercial silicon avalanche photo diode units to the left ...
Detection stage of the NIST prototype quantum key distribution system: Photons are "up-converted" from 1310 to 710 nm by one of the two NIST-designed converters at right, then sent to one of two commercial silicon avalanche photo diode units to the left. Credit: NIST

Researchers at NIST have built a prototype high-speed quantum key distribution system, based on a new detector system that achieves dramatically lower noise levels than similar systems.


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