arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1306.6641quant-ph
收藏

真能时纠缠的长距离分布

Long-distance distribution of genuine energy-time entanglement

A. Cuevas, G. Carvacho, G. Saavedra, J. Cariñe, W. A. T. Nogueira, M. Figueroa, A. Cabello, P. Mataloni, G. Lima, G. B. Xavier

摘要:

任何基于纠缠的量子通信的实际实现都必须具有内在的安全性,并且能够跨越长距离,避免通信双方之间的直线需求。贝尔不等式的违反提供了一种在不知道设备内部工作原理的情况下验证量子链路的方法。能量-时间纠缠量子通信满足所有这些要求。然而,目前采用的标准配置存在一个根本障碍:除了其他漏洞外,还存在一个可以被利用来破坏通信安全性的固有几何漏洞。在这里,我们展示了第一个实验贝尔违反能量-时间纠缠分布在1公里的光纤,是免费的这个几何漏洞。这是通过采用一种新的实验设计,并通过使用主动稳定的光纤为基础的长干涉仪。我们的研究结果代表了光纤中长距离安全量子通信的重要一步。

英文摘要:

Any practical realization of entanglement-based quantum communication must be intrinsically secure and able to span long distances avoiding the need of a straight line between the communicating parties. The violation of Bell's inequality offers a method for the certification of quantum links without knowing the inner workings of the devices. Energy-time entanglement quantum communication satisfies all these requirements. However, currently there is a fundamental obstacle with the standard configuration adopted: an intrinsic geometrical loophole that can be exploited to break the security of the communication, in addition to other loopholes. Here we show the first experimental Bell violation with energy-time entanglement distributed over 1 km of optical fibers that is free of this geometrical loophole. This is achieved by adopting a new experimental design, and by using an actively stabilized fiber-based long interferometer. Our results represent an important step towards long-distance secure quantum communication in optical fibers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑