The University of Stuttgart, in collaboration with Saarland University and Leibniz IFW Dresden, successfully deployed an entanglement-based quantum key distribution (QKD) link using a quantum dot photon source. The system generated 14.2 Mbit of secure key material over a 1.59 km fiber link, achieving one-time pad image encryption. This demonstrates the viability of quantum dots with frequency conversion for metropolitan quantum key networks.
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