Continuous-variable quantum digital signatures that can withstand coherent attacks

• URL: http://arxiv.org/abs/2407.03609v2
• Date: Fri, 22 Nov 2024 06:39:26 GMT
• Title: Continuous-variable quantum digital signatures that can withstand coherent attacks
• Authors: Yi-Fan Zhang, Wen-Bo Liu, Bing-Hong Li, Hua-Lei Yin, Zeng-Bing Chen,
• Abstract summary: Quantum digital signatures (QDSs) guarantee authenticity, integrity, and nonrepudiation of classical messages based on quantum laws. We introduce a CV QDS protocol designed to withstand general coherent attacks through the use of a cutting-edge fidelity test function. Results demonstrate a significant reduction of eight orders of magnitude in signature length for a megabit message signing task.
• Score: 5.777874043843867
• License:
• Abstract: Quantum digital signatures (QDSs), which utilize correlated bit strings among sender and recipients, guarantee the authenticity, integrity, and nonrepudiation of classical messages based on quantum laws. Continuous-variable (CV) quantum protocol with heterodyne and homodyne measurement has obvious advantages of low-cost implementation and easy wavelength division multiplexing. However, security analyses in previous researches are limited to the proof against collective attacks in finite-size scenarios. Moreover, existing multibit CV QDS schemes have primarily focused on adapting single-bit protocols for simplicity of security proof, often sacrificing signature efficiency. Here, we introduce a CV QDS protocol designed to withstand general coherent attacks through the use of a cutting-edge fidelity test function, while achieving high signature efficiency by employing a refined one-time universal hashing signing technique. Our protocol is proved to be robust against finite-size effects and excess noise in quantum channels. In simulation, results demonstrate a significant reduction of eight orders of magnitude in signature length for a megabit message signing task compared with existing CV QDS protocols and this advantage expands as the message size grows. Our work offers a solution with enhanced security and efficiency, paving the way for large-scale deployment of CV QDSs in future quantum networks.

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