25 July 2017
Chinese scientists have made another breakthrough in quantum communication, demonstrating long-distance free-space quantum key distribution during daylight. A team from the University of Science and Technology of China led by Pan Jianwei, has overcome the sunlight noise issue and demonstrated free-space quantum key distribution over 53 km during the day. Pan's team chose a wavelength of 1,550 nanometers and developed free-space single-mode fibre-coupling technology and ultra-low-noise upconversion single-photon detectors to achieve the daytime distribution.
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