Characterizing High-Quality High-Dimensional Quantum Key Distribution by State Mapping Between Different Degrees of Freedom
Characterizing High-Quality High-Dimensional Quantum Key Distribution by State Mapping Between Different Degrees of Freedom
复制标题
通过不同自由度之间的状态映射表征高质量高维量子密钥分布
DOI：
10.1103/physrevapplied.11.024070
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发表时间：
2019
影响因子：
4.6
通讯作者：
Han Zheng-Fu
中科院分区：
文献类型：
--
作者：
Wang Fang-Xiang;Chen Wei;Yin Zhen-Qiang;Wang Shuang;Guo Guang-Can;Han Zheng-Fu
量子密钥分配(QKD)用量子力学保证了合法各方之间的安全通信。高维量子密钥分发(HDQKD)不仅提高了密钥传输速率，而且能够容忍较高的量子误码率(QBER)。许多HDQKD实验都是利用轨道角动量(OAM)光子作为轨道角动量(OAM)的自由度(DOF)来实现的，该光子是HD量子信息的潜在来源。在这项工作中，我们提出并表征了利用不同自由度之间的状态映射可以实现高质量的基于极化-OAM混合态的HDQKD。原则性验证实验的准备和测量程序都简单而稳定。实验证明，采用弱相干光源和诱饵态方法，对于四维量子密钥分发系统，每个筛选信号可以获得$(0.600.06)$QBER和$1.849\pm 0.008$比特的密钥传输速率。
Quantum key distribution (QKD) guarantees the secure communication between legitimate parties with quantum mechanics. High-dimensional QKD (HDQKD) not only increases the secret key rate but also tolerates higher quantum bit error rate (QBER). Many HDQKD experiments have been realized by utilizing orbital-angular-momentum (OAM) photons as the degree of freedom (DOF) of OAM of the photon is a prospective resource for HD quantum information. In this work we proposed and characterized that a high-quality HDQKD based on polarization-OAM hybrid states can be realized by utilizing state mapping between different DOFs. Both the preparation and measurement procedures of the proof-of-principle verification experiment are simple and stable. Our experiment verified that $(0.60\pm 0.06)\%$ QBER and $1.849\pm 0.008$ bits secret key rate per sifted signal can be achieved for a four-dimensional QKD with the weak coherent light source and decoy state method.