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Quantum Information Processing

Re-pairing strategy for mode-pairing quantum key distribution

Xingyu Zhou, Jiarui Hu, Chunhui Zhang, Qin Wang

Published Mar 24, 2025• 1 citation
Publisher
DOI
10.1007/s11128-025-04716-7

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Mode-pairing quantum key distribution (MP-QKD) holds great promise for the practical implementation of QKD in the near future. It combines the security advantages of measurement device independence while still being capable of breaking the Pirandola-Laurenza-Ottaviani-Banchi bound without the need for highly demanding phase-locking and phase-tracking technologies for deployment. In this work, we explore optimization strategies for MP-QKD in a wavelength-division multiplexing scenario. The simulation results reveal that incorporation of multiple wavelengths not only leads to a direct increase in key rate but also enhances the pairing efficiency by employing our novel pairing strategies among different wavelengths. As a result, our work provides a new avenue for the future application and development of MP-QKD.