论文标题
基于断层扫描的量子密钥分布
Tomography-based Quantum Key Distribution
论文作者
论文摘要
先前已经显示，量子状态断层扫描可用于增加Qubits特殊情况（即d = 2）的量子键分布（QKD）的键率。在这里，我们考虑了较高维度的情况，即Qudits，并表明，对于标准（D+1）-BASIS协议，量子层造影术也可以提高基于D的基于D维的QKD方案的关键率。我们将结果应用于基于OAM（轨道角动量）编码的先前QKD实验，并证明了基于层析成像的QKD方案的优势。此外，我们将基于断层扫描的QKD协议的关键率与独立于参考框架的QKD协议进行了比较。我们表明，对于旋转通道，这两个协议给出了相同的关键率。但是，对于任何其他渠道，基于断层扫描的QKD协议总是比独立于参考框架的QKD协议提供更高的关键率。
It has previously been shown that quantum state tomography can be used to increase the key rate of quantum key distribution (QKD) for the special case of qubits (i.e.,d=2). Here, we consider the case of higher dimensions, i.e., qudits, and show that, for a prime number d>2, quantum state tomography can also improve the key rate of d-dimensional qudit-based QKD schemes, compared to the standard (d+1)-basis protocol. We apply our results to previous QKD experiments based on OAM (orbital angular momentum) encoding and demonstrate the advantage of tomography-based QKD protocols. Moreover, we compare the key rate of tomography-based QKD protocol with reference-frame-independent QKD protocol. We show that, for a rotation channel, the two protocols give the same key rate. However, for any other channels, tomography-based QKD protocol always gives a higher key rate than reference-frame-independent QKD protocol.
