1 云南天衢量子科技有限公司, 云南 昆明 650000
2 中国科学院电子学研究所, 微波成像技术国家重点实验室, 北京 100190
量子数字签名在保证消息的完整性和不可抵赖性的同时, 还具有基于量子力学的信息理论安全性。目前, 大多数关于量子数字签名的研究都基于多诱骗态协议。由于统计涨落等因素的存在, 多诱骗态会限制系统的性能。为了提高量子数字签名系统的性能, 提出一种单诱骗态量子数字签名协议, 并给出了该协议的安全性分析及性能仿真结果。通过数值模拟比较了单诱骗态协议和 2 诱骗态协议的性能, 结果表明单诱骗态方法在大多数传输距离下虽然对系统的签名率仅有少许提升, 但是单诱骗态协议实现起来更加简单, 因此具有更高的实用性。
量子光学 量子数字签名 量子密钥分发 诱骗态 签名率 quantum optics quantum digital signature quantum key distribution decoy state signature rate
Author Affiliations
Abstract
Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026, China
Quantum key distribution (QKD) is a major research topic because it provides unconditional security. Unfortunately, many imperfections remain in QKD's experimental realization. The Faraday–Michelson (FM) QKD system is proposed to eliminate these imperfections using polarization. However, the long arm's phase modulator (PM) has an unexpected insertion loss, meaning that the state sent is no longer perfect. In this letter, we propose an alternative FM-QKD system structure, and analyze the security and key generation rate in comparison with the original system via diffeerent analysis methods. We find an obvious key rate improvement when the PM insertion loss is not extremely small.
270.5565 Quantum communications 270.5568 Quantum cryptography Chinese Optics Letters
2015, 13(1): 012701
