Proof-of-principle experimental realization of a qubit-like qudit-based quantum key distribution scheme
Proof-of-principle experimental realization of a qubit-like qudit-based quantum key distribution scheme
复制标题
基于类量子位 qudit 的量子密钥分配方案的原理验证实验实现
DOI：
10.1088/2058-9565/aaace4
复制
发表时间：
2018
影响因子：
6.7
通讯作者：
Han Zheng-Fu
中科院分区：
文献类型：
--
作者：
Wang Shuang;Yin Zhen-Qiang;Chau HF;Chen Wei;Wang Chao;Guo Guang-Can;Han Zheng-Fu
与基于量子比特的协议相比，基于qudit的量子密钥分发协议通常允许两个合作方在较高的信道噪声下共享无条件安全的密钥。然而，一般来说，在基于 qdit 的协议中准备和测量所需的量子态是非常困难的。一个例外是最近提出的高度容错的基于 qdit 的协议，称为 Chau15 (Chau 2015 Phys. Rev. A 92 062324)。值得注意的是，该协议中的状态准备和测量可以相对容易地完成，因为所需的状态几乎像量子位的对角基状态一样进行相位编码。在这里，我们报告了 Chau15 协议的首次原理验证演示。我们实验的一个亮点是它的后处理是基于实用的单向方式，而Chau (2015 Phys. Rev. A 92 062324)的原始提案依赖于复杂的双向后处理，这对实验来说是一个很大的挑战。此外，通过操纵时间仓qudit并使用可变延迟干涉仪进行测量，我们的实现可扩展到高维qudit，并证实了Chau15协议的实验可行性。
In comparison to qubit-based protocols, qudit-based quantum key distribution ones generally allow two cooperative parties to share unconditionally secure keys under a higher channel noise. However, it is very hard to prepare and measure the required quantum states in qudit-based protocols in general. One exception is the recently proposed highly error tolerant qudit-based protocol known as the Chau15 (Chau 2015 Phys. Rev. A 92 062324). Remarkably, the state preparation and measurement in this protocol can be done relatively easily since the required states are phase encoded almost like the diagonal basis states of a qubit. Here we report the first proof-of-principle demonstration of the Chau15 protocol. One highlight of our experiment is that its post-processing is based on practical one-way manner, while the original proposal in Chau (2015 Phys. Rev. A 92 062324) relies on complicated two-way post-processing, which is a great challenge in experiment. In addition, by manipulating time-bin qudit and measurement with a variable delay interferometer, our realization is extensible to qudit with high-dimensionality and confirms the experimental feasibility of the Chau15 protocol.