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arXiv 1111.3413quant-ph
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与测量设备无关的量子密钥分发和基相关缺陷的相位编码方案

Phase encoding schemes for measurement device independent quantum key distribution and basis-dependent flaw

Kiyoshi Tamaki, Hoi-Kwong Lo, Chi-Hang Fred Fung, Bing Qi

摘要:

在相位编码方案下,研究了具有基依赖缺陷的与测量设备无关的量子密钥分发(MDIQKD)的无条件安全性。我们提出了两种方案的相位编码,第一个采用锁相技术与非相位随机化的相干脉冲的使用,和第二个使用标准的BB84相位编码脉冲到偏振模式的转换。我们证明了这些方案的无条件安全性,我们还模拟了简单的设备模型,容纳不完善的基础上的密钥生成速率。我们的模拟结果表明,这些计划与当前的技术的可行性,并突出了良好的保真度之间的密度矩阵在两个基地的状态准备的重要性。由于基依赖性缺陷不仅是MDIQKD的问题,也是标准QKD的问题,因此我们的工作突出了在实际QKD系统中精确信号源的重要性。注:我们将本文的勘误表包括在附录C中。修正并不影响论文中主要结论的正确性,即MDIQKD中状态准备的重要性以及我们的方案可以用我们假设的实际信道模式生成密钥的事实。

英文摘要:

In this paper, we study the unconditional security of the so-called measurement device independent quantum key distribution (MDIQKD) with the basis-dependent flaw in the context of phase encoding schemes. We propose two schemes for the phase encoding, the first one employs a phase locking technique with the use of non-phase-randomized coherent pulses, and the second one uses conversion of standard BB84 phase encoding pulses into polarization modes. We prove the unconditional security of these schemes and we also simulate the key generation rate based on simple device models that accommodate imperfections. Our simulation results show the feasibility of these schemes with current technologies and highlight the importance of the state preparation with good fidelity between the density matrices in the two bases. Since the basis-dependent flaw is a problem not only for MDIQKD but also for standard QKD, our work highlights the importance of an accurate signal source in practical QKD systems. Note: We include the erratum of this paper in Appendix C. The correction does not affect the validity of the main conclusions reported in the paper, which is the importance of the state preparation in MDIQKD and the fact that our schemes can generate the key with the practical channel mode that we have assumed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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