Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Discrete Modulation Source Enhancement for Continuous Variable Quantum Key Distribution through Photon Catalyzing

Version 1 : Received: 9 September 2020 / Approved: 10 September 2020 / Online: 10 September 2020 (06:01:48 CEST)

How to cite: Zhou, Z.; Zou, S.; Mao, Y.; Huang, T.; Guo, Y. Discrete Modulation Source Enhancement for Continuous Variable Quantum Key Distribution through Photon Catalyzing. Preprints 2020, 2020090224 (doi: 10.20944/preprints202009.0224.v1). Zhou, Z.; Zou, S.; Mao, Y.; Huang, T.; Guo, Y. Discrete Modulation Source Enhancement for Continuous Variable Quantum Key Distribution through Photon Catalyzing. Preprints 2020, 2020090224 (doi: 10.20944/preprints202009.0224.v1).

Abstract

Establishing global high-rate secure communications is a potential application of continuous-variable quantum key distribution (CVQKD) but also challenging for long-distance transmissions in metropolitan areas. The discrete modulation(DM) can make up for the shortage of transmission distance that has a unique advantage against all side-channel attacks, however its further performance improvement requires source preparation in the presence of noise and loss. Here, we consider the effects of photon catalysis (PC) on the DM-involved source preparation for lengthening the maximal transmission distance of the CVQKD system. We address a zero-photon catalysis (ZPC)-based source preparation for enhancing the DM-CVQKD system. The statistical fluctuation due to the finite length of data is taken into account for the practical security analysis. Numerical simulations show that the ZPC-based DM-CVQKD system can not only achieve the extended maximal transmission distance, but also contributes to the reasonable increase of the secret key rate. This approach enables the DM-CVQKD to tolerate lower reconciliation efficiency, which may promote the practical implementation solutions compatible with classical optical communications using state-of-the-art technology.

Subject Areas

photon catalyzing; discrete modulation; dontinuous-variable; quantum key distribution; quantum communications

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