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arXiv 1002.4226quant-ph
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用于量子密钥分发的混合纠缠光子对源的性能

Performance of hybrid entanglement photon pair source for quantum key distribution

M. Fujiwara, M. Toyoshima, M. Sasaki, K. Yoshino, Y. Nambu, A. Tomita

摘要:

我们报告的两个不同的自由度,一个1550 nm的时间仓量子比特和一个810 nm的偏振量子比特之间的混合纠缠对的源的实验演示。利用由Glan激光棱镜和保偏光纤组成的非对称马赫-曾德尔干涉仪对波长为810 nm的偏振量子比特进行变换。在庞加莱球上,纠缠态变换后,Z-Z和X-X轴方向的符合计数率分别为95.8%和88%,符合计数率大于800 c/s。这些值远高于违反贝尔不等式并允许在量子密钥分发中提取安全密钥所需的70.7%的阈值。

英文摘要:

We report on the experimental demonstration of a source of hybrid entanglement pairs between two different degrees of freedom, a 1550 nm time-bin qubit and an 810 nm polarization qubit. The polarization qubit at 810 nm is transformed by an asymmetric Mach-Zehnder interferometer consisted of a Glan laser prism and a polarization-maintaining fiber. We obtained visibilities of 95.8% and 88% along Z-Z and X-X axes on the Poincare sphere, respectively with a coincidence count rate of more than 800 c/s after entanglement format transformation. These values are well above the threshold of 70.7% needed to violate a Bell inequality and allow distilling a secure key in the quantum key distribution.

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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