Secret key rate of multi-ring M-APSK continuous variable quantum key distribution Article Swipe

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Margarida Almeida , Daniel Pereira , Nelson J. Muga , M. Facão , Armando N. Pinto , Nuno A. Silva · YOU? · · 2021 · Open Access · · DOI: https://doi.org/10.1364/oe.439992

Discrete modulation continuous variable quantum key distribution (DM-CV-QKD) is highly considered in real implementations to avoid the complexity of Gaussian modulation (GM), which is optimum in terms of the key rate. DM-CV-QKD systems usually consider M-symbol phase shift keying (M-PSK) constellations. However, this type of constellation cannot reach transmission distances and key rates as high as GM, limiting the practical implementation of CV-QKD systems. Here, by considering M-symbol amplitude and phase shift keying (M-APSK) constellations, we can approximate GM. Indeed, considering finite-size effects, 4 ring 64-APSK can reach 52.0 km, only 7.2 km less than GM and 282% the maximum achievable transmission distance for 8-PSK.

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article

Language

en

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https://doi.org/10.1364/oe.439992

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gold

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37

References

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https://openalex.org/W3208346388

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