Xu Feihu, Arrazola Juan Miguel, Wei Kejin, Wang Wenyuan, Palacios-Avila Pablo, Feng Chen, Sajeed Shihan, Lütkenhaus Norbert, Lo Hoi-Kwong
Center for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario, Canada M5S 3H6.
Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G4.
Nat Commun. 2015 Oct 30;6:8735. doi: 10.1038/ncomms9735.
Quantum communication holds the promise of creating disruptive technologies that will play an essential role in future communication networks. For example, the study of quantum communication complexity has shown that quantum communication allows exponential reductions in the information that must be transmitted to solve distributed computational tasks. Recently, protocols that realize this advantage using optical implementations have been proposed. Here we report a proof-of-concept experimental demonstration of a quantum fingerprinting system that is capable of transmitting less information than the best-known classical protocol. Our implementation is based on a modified version of a commercial quantum key distribution system using off-the-shelf optical components over telecom wavelengths, and is practical for messages as large as 100 Mbits, even in the presence of experimental imperfections. Our results provide a first step in the development of experimental quantum communication complexity.
量子通信有望创造出具有颠覆性的技术，这些技术将在未来通信网络中发挥至关重要的作用。例如，量子通信复杂性研究表明，量子通信能够使解决分布式计算任务所需传输的信息量呈指数级减少。最近，已经有人提出使用光学实现方式来实现这一优势的协议。在此，我们报告了一个量子指纹识别系统的概念验证实验演示结果，该系统能够传输比最知名的经典协议更少的信息。我们的实现基于一个商用量子密钥分发系统的修改版本，使用电信波长的现成光学组件，即使存在实验缺陷，对于高达100兆比特的消息也是实用的。我们的结果为实验量子通信复杂性的发展迈出了第一步。
