Optimization of continuous variables quantum key distribution using discrete modulation

Daniel Pereira; Nuno A. Silva; Margarida Almeida; Armando N. Pinto

doi:10.1117/12.2638896

7 December 2022 Optimization of continuous variables quantum key distribution using discrete modulation

Daniel Pereira, Nuno A. Silva, Margarida Almeida, Armando N. Pinto

Proceedings Volume 12274, Emerging Imaging and Sensing Technologies for Security and Defence VII; 122740S (2022) https://doi.org/10.1117/12.2638896
Event: SPIE Security + Defence, 2022, Berlin, Germany

Abstract

Continuous Variables Quantum Key Distribution (CV-QKD) tackles the problem of the generation and distribution of cryptographic keys without assuming any computational limitations while employing standard telecom equipment. Gaussian Modulation (GM) theoretically maximizes the information a CV-QKD system is capable of transmitting while exhibiting a higher resistance to excess channel noise. However, GM-CV-QKD protocols put an extreme burden on the transmitter’s random number source and tend to be more susceptible to imperfect state preparation. Due to these difficulties, most experimental implementations of CV-QKD have used Discrete Modulation (DM). The closer the DM constellation approaches a GM one, the closer the theoretical performance of the associated system will be to the optimum value. To achieve this, high-cardinality constellations, coupled with probabilistic shaping, can be explored. However, choosing a too complex constellation will cause the modulation stage imperfections to again become apparent. Thus, the choice of the constellation format is not direct and is of high importance. In this work we present a methodology to determine the optimum constellation for a given DM-CV-QKD system, taking into account the limitations of the modulation stage, choosing from a variety of M-QAM and M-APSK constellations coupled with probabilistic shaping. Our obtained methodology will allow for the optimum modulation format for each specific system to be selected.

Conference Presentation

Citation Download Citation

Daniel Pereira, Nuno A. Silva, Margarida Almeida, and Armando N. Pinto "Optimization of continuous variables quantum key distribution using discrete modulation", Proc. SPIE 12274, Emerging Imaging and Sensing Technologies for Security and Defence VII, 122740S (7 December 2022); https://doi.org/10.1117/12.2638896

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