论文标题
量子密钥分布克服极端噪声：使用高维纠缠同时进行子空间编码
Quantum key distribution overcoming extreme noise: simultaneous subspace coding using high-dimensional entanglement
论文作者
论文摘要
高维纠缠有望增加光子的信息能力，现在通常会生成单个光子自由度的时空自由度。这些系统的一个奇怪特征是尽管数据中有很强的噪音，但有可能证明纠缠。我们表明，还可以通过引入同时使用高维系统的mutliple子空间来利用这种嘈杂的高维纠缠来利用量子密钥分布。即使在极度嘈杂的实验条件下，我们的协议也可以用来建立秘密密钥，即Qubit协议失败的情况。为了表明，我们分析了适用于两个最常用的高维纠缠来源的噪声模型协议的性能：时间垃圾箱和空间模式。
High-dimensional entanglement promises to increase the information capacity of photons and is now routinely generated exploiting spatio-temporal degrees of freedom of single photons. A curious feature of these systems is the possibility to certify entanglement despite strong noise in the data. We show that it is also possible to exploit this noisy high-dimensional entanglement for quantum key distribution by introducing a protocol that uses mutliple subspaces of the high-dimensional system simultaneously. Our protocol can be used to establish a secret key even in extremely noisy experimental conditions, where qubit protocols fail. To show that, we analyze the performance of our protocol for noise models that apply to the two most commonly used sources of high-dimensional entanglement: time bins and spatial modes.
