A multipartite device-independent QKD protocol generates shared keys directly from measurement settings certified by maximal violation of the Hardy paradox, achieving positive key rates and higher pairwise rates.
The curves show how the achievable key rate decreases as the Hardy correlations deviate from their ideal values
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Multipartite Hardy paradox unlocks device-independent key sharing
A multipartite device-independent QKD protocol generates shared keys directly from measurement settings certified by maximal violation of the Hardy paradox, achieving positive key rates and higher pairwise rates.