Affiliation:
1. Shanghai Research Center for Quantum Sciences
2. Shanghai XunTai Quantech Co., Ltd.,
Abstract
Data acquisition in a continuous-variable quantum key distribution (CV-QKD) system is a necessary step to obtain secure secret keys. And the known data acquisition methods are commonly based on the assumption that the channel transmittance is constant. However, the channel transmittance in free-space CV-QKD fluctuates during the transmission of quantum signals, and the original methods are not applicable in this scenario. In this paper, we propose a data acquisition scheme based on the dual analog-to-digital converter (ADC). In this scheme, two ADCs with the same sampling frequency as the pulse repetition rate of the system and a dynamic delay module (DDM), which are used to construct a high-precision data acquisition system, eliminate the effect of transmittance fluctuation by a simple division operation of the data from the two ADCs. Simulation and proof-of-principle experimental results show that the scheme is effective for free-space channels and can achieve high-precision data acquisition under the condition of fluctuation of channel transmittance and very low signal-to-noise ratio (SNR). Furthermore, we introduce the direct application scenarios of the proposed scheme for free-space CV-QKD system and verify their feasibilities. This method is of great significance to promote the experimental realization and practical application of free-space CV-QKD.
Funder
National Natural Science Foundation of China
Shanghai Municipal Science and Technology Major Project
Key R&D Program of Guangdong province
Subject
Atomic and Molecular Physics, and Optics
Cited by
2 articles.
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1. Continuous-variable quantum key distribution system: Past, present, and future;Applied Physics Reviews;2024-03-01
2. Modular Facility of Quantum Key Distribution in a Free Space;2023 Wave Electronics and its Application in Information and Telecommunication Systems (WECONF);2023-05-29