Continuous-mode quantum key distribution with digital signal processing

• URL: http://arxiv.org/abs/2207.04991v3
• Date: Wed, 29 Mar 2023 08:37:48 GMT
• Title: Continuous-mode quantum key distribution with digital signal processing
• Authors: Ziyang Chen, Xiangyu Wang, Song Yu, Zhengyu Li, Hong Guo
• Abstract summary: We propose a method of analyzing continuous-mode state processing by linear DSP via temporal-modes theory. The proposed practicality oriented security analysis method paves the way for building classical compatible digital CVQKD.
• Score: 7.261178075085931
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Continuous-variable quantum key distribution (CVQKD) offers the specific advantage of sharing keys remotely by the use of standard telecom components, thereby promoting cost-effective and high-performance metropolitan applications. Nevertheless, the introduction of high-rate spectrum broadening has pushed CVQKD from a single-mode to a continuous-mode region, resulting in the adoption of modern digital signal processing (DSP) technologies to recover quadrature information from continuous-mode quantum states. However, the security proof of DSP involving multi-point processing is a missing step. Here, we propose a generalized method of analyzing continuous-mode state processing by linear DSP via temporal-modes theory. The construction of temporal modes is key in reducing the security proof to single-mode scenarios. The proposed practicality oriented security analysis method paves the way for building classical compatible digital CVQKD.

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