来自任意小的非局部性的无限制的设备独立量子密钥率
1Department of Mathematics, University of York, Heslington, York, YO10 5DD, United Kingdom.
Physical review letters
|June 10, 2024
概括
设备独立量子密钥分布 (DIQKD) 的安全性并不取决于所观察到的贝尔非局部性的数量. 即使是最小的非局部性也可以产生高的量子密钥率,挑战已有的安全假设.
科学领域:
- 量子信息科学 量子信息科学
- 量子密码学 量子密码学
- 量子力学的基础 量子力学的基础
背景情况:
- 设备独立的量子密钥分布 (DIQKD) 提供了使用潜在不值得信赖的设备的远程当事人之间的加密密钥的可证明的安全性.
- 在DIQKD中的安全证明依赖于贝尔实验的测量结果统计数据,由量子理论的基本规律保证.
- 虽然贝尔非局部性对于DIQKD安全性是必要的,但它并不总是足够的,正如最近的发现表明的那样.
研究的目的:
- 为了研究贝尔非局部性和关键速率在设备独立量子密钥分布中的定量关系.
- 确定安全的DIQKD是否需要最低水平的非局部性.
- 探索从具有最小非局部性的相关性中提取关键利率的可能性.
主要方法:
- 在自我测试协议和独立于设备的量子密钥分配之间建立了严格的连接.
- 这些技术应用于一个新的贝尔不等式家族,具有众多的测量结果.
- 分析测量结果统计数据及其对非本地和密钥生成的影响.
主要成果:
- 证明了对于设备独立量子密钥分布所需的贝尔非局部性的数量没有下限.
- 展示了可以从具有任意小非局部性的相关性中提取不受限制的设备独立密钥率.
- 确定DIQKD关键率和贝尔非局部性之间的一般定量关系不能被定义.
结论:
- 独立于设备的量子密钥分布的安全性与观察到的贝尔非局部性的程度并不成正比.
- 最小的非局部性足以以独立于设备的方式生成大量的安全密钥材料.
- 未来的DIQKD安全研究应该考虑Bell非局部性的量化衡量之外的替代指标.
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