Amplitude-Phase Modulated CVQKD Protocol

Micael Andrade Dias, Francisco M. de Assis

DOI: 10.14209/sbrt.2021.1570734220

Evento: XXXIX Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2021)

Keywords: CVQKD Discrete Modulation Constellation Shaping

Abstract

Here we report the performance of a discrete modulated CVQKD protocol based on eight and sixteen state optimal APK constellations with pure loss quantum channel transmission. Our constellations use the same amplitudes and state probability as in an optimal four-state unidimensional constellation model and applies amplitude/phase modulation on the quadratures of coherent states. We compare the obtained results with the performance of conventional m-PSK and m-APK constellations. The results show that the proposed constellations applied to CVQKD protocol outperforms the conventional PSK and APK based protocols in both secret key rate and link distance. In special, our protocol is able to accomplish viable SKR's in low transmittance regime, ..\tau<0.2...

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