Overcoming Noise in Entanglement Distribution
Overcoming Noise in Entanglement Distribution
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DOI：
10.1103/physrevx.9.041042
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发表时间：
2019-11-26
影响因子：
12.5
通讯作者：
Huber, Marcus
中科院分区：
文献类型：
--
作者：
Ecker, Sebastian;Bouchard, Frederic;Huber, Marcus
噪声可以被认为是量子信息的天敌。高维纠缠的一个通常隐含的好处是它对噪声的弹性增加。然而，以实验上有意义的方式表现这种潜力是具有挑战性的，以前从未做过。在无限维空间中，离散化是不可避免的，并使量子态的有效维数成为一个可调参数。由于实验技术和理论工具的进步，我们通过确定两条利用高维纠缠态的途径来证明对噪声的抵抗力。我们的研究是基于两个独立的实验，利用典型的纠缠光子对的时空特性。遵循这些不同的噪声恢复途径，我们能够证明光子轨道角动量和能量时间自由度的纠缠度高达噪声条件，分别对应于72%和92%的噪声分数。我们的工作为实际的量子通信系统铺平了道路，这些系统能够超越当前的噪声和距离限制，同时不影响潜在的设备独立性。
Noise can be considered the natural enemy of quantum information. An often implied benefit of high-dimensional entanglement is its increased resilience to noise. However, manifesting this potential in an experimentally meaningful fashion is challenging and has never been done before. In infinite dimensional spaces, discretization is inevitable and renders the effective dimension of quantum states a tunable parameter. Owing to advances in experimental techniques and theoretical tools, we demonstrate an increased resistance to noise by identifying two pathways to exploit high-dimensional entangled states. Our study is based on two separate experiments utilizing canonical spatiotemporal properties of entangled photon pairs. Following these different pathways to noise resilience, we are able to certify entanglement in the photonic orbital-angular-momentum and energy-time degrees of freedom up to noise conditions corresponding to a noise fraction of 72% and 92%, respectively. Our work paves the way toward practical quantum communication systems that are able to surpass current noise and distance limitations, while not compromising on potential device independence.