aiqbench analysis
This research introduces an optimized multi-ring M-APSK modulation scheme specifically designed to enhance the finite-size secret key rate in discrete-modulated continuous variable quantum key distribution (CV-QKD). By utilizing a Gram matrix method for spectral analysis, the study demonstrates that optimizing ring radius ratios and probabilities can extend transmission distances by approximately 15% compared to conventional binomial structures. These findings directly advance practical implementations of high-speed, long-distance secure communication networks relying on advanced quantum modulation techniques.
Ring Optimized M-APSK Modulation for Discrete Modulated CV-QKD
arXiv:2608.01723v1 Announce Type: new Abstract: This paper proposes a multi ring M-APSK constellation optimization method for discrete-modulated continuous variable quantum key distribution. Unlike conventional APSK structures with fixed ring spacing and predefined ring probabilities, the proposed method optimizes the ring radius ratio and ring probability to improve the finite-size secret key rate. A method based on the Gram matrix is used to calculate the nonzero spectrum of the average state $\tau$, and fidelity is used to compare the optimized discrete average state with the Gaussian average state. The results show that the proposed structure extends the maximum transmission distance of 16-APSK by approximately 15% compared with the conventional binomial APSK structure. The optimization gain is larger for small size APSK constellations, where the average state has a larger structural gap from Gaussian modulation.
Abstract:This paper proposes a multi ring M-APSK constellation optimization method for discrete-modulated continuous variable quantum key distribution. Unlike conventional APSK structures with fixed ring spacing and predefined ring probabilities, the proposed method optimizes the ring radius ratio and ring probability to improve the finite-size secret key rate. A method based on the Gram matrix is used to calculate the nonzero spectrum of the average state $\tau$, and fidelity is used to compare the optimized discrete average state with the Gaussian average state. The results show that the proposed structure extends the maximum transmission distance of 16-APSK by approximately 15% compared with the conventional binomial APSK structure. The optimization gain is larger for small size APSK constellations, where the average state has a larger structural gap from Gaussian modulation.
arXiv:2608.01723 [quant-ph]
(or arXiv:2608.01723v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2608.01723 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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