Demonstration of Bennett-Brassard-Mermin protocol with entangled photonic qudits over 60 km, indicating improvements in qudit rates.
We demonstrate the Bennett-Brassard-Mermin 1992 quantum key distribution protocol with time-bin entangled photonic qudits over a 60-km-long optical fiber link. The on-chip framework utilized therein addresses low effective qudit rates associated with time-bin encoding schemes.
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Sciara et al. (2025) studied this question.