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This research establishes a definitive mathematical link between the PLOB bound and practical error tolerance in quantum key distribution, revealing that current discrete-variable protocols may be operating conservatively. By translating quantum bit error rate thresholds into concrete distance limits for both fiber and free-space links, the study provides a rigorous framework for designing more robust repeater-assisted QKD networks. These findings are critical for advancing the scalability of secure quantum communication infrastructure by identifying previously overlooked capacity gaps in noise modeling.

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Pirandola-Laurenza-Ottaviani-Banchi bound unlocks longer QKD links

Quantum Zeitgeist10 septembrie 20266 min de cititArticolul și perspectiva sunt în engleză.

Quantum key distribution (QKD) is affected by rate-loss limitations, requiring intermediate repeater stations to form networks of nodes. The Pirandola-Laurenza-Ottaviani-Banchi (PLOB) bound establishes -log_2(1-η) as the maximum key bits per channel use over a lossy channel with transmissivity η.

Researchers have established a definitive link between the maximum achievable key rate in quantum key distribution and the tolerable error rates of practical protocols. The work demonstrates a necessary and sufficient condition for strictly positive two-way assisted capacities of the qubit Pauli channel, revealing a fundamental limit on reliable information transmission. This analysis identifies the possibility of undiscovered discrete-variable QKD protocols capable of tolerating higher quantum bit error rates than currently known, suggesting existing designs may be unnecessarily conservative. The Pirandola-Laurenza-Ottaviani-Banchi bound establishes that -log_2(1-η) is the maximum possible number of key bits per channel use achievable in repeaterless QKD. This connection between the PLOB bound and practical key rate limits had…

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