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"There is also a new type of quantum key distribution (QKD) source that's been introduced in the literature, called a passive QKD source. Passive QKD sources don't even use modulators, so these ...
Schematic diagram of the quantum key distribution experiment between the quantum microsatellite Jinan-1 and ground stations. Credit: Nature (2025). DOI: 10.1038/s41586-025-08739-z ...