Quantum information protocols are being deployed in increasingly practical scenarios, via optical fibers or free space, alongside classical communications channels. However, entanglement, the most critical resource to deploy to the communicating parties, is also the most fragile to the noise-induced degradations. Here we show that polarization-frequency hyperentanglement of photons can be effectively employed to enable noise-resistant distribution of polarization entanglement through noisy quantum channels. In particular, we demonstrate that our hyperentanglement-based scheme results in an orders-of-magnitude increase in the SNR for distribution of polarization-entangled qubit pairs, enabling quantum communications even in the presence of strong noise that would otherwise preclude quantum operations due to noise-induced entanglement sudden death. While recent years have witnessed tremendous interest and progress in long-distance quantum communications, previous attempts to deal with the noise have mostly been focused on passive noise suppression in quantum channels. Here, via the use of hyperentangled degrees of freedom, we pave the way toward a universally adoptable strategy to enable entanglement-based quantum communications via strongly noisy quantum channels.

中文翻译：

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使用超纠缠的抗噪声量子通信

量子信息协议正通过光纤或自由空间以及经典通信通道部署在越来越实用的场景中。然而，纠缠是部署到通信方的最关键资源，对于噪声引起的降级来说也是最脆弱的。在这里，我们表明可以有效地利用光子的极化频率超纠缠来通过噪声量子通道实现极化纠缠的抗噪声分布。特别是，我们证明了我们基于超纠缠的方案导致极化纠缠量子位对分布的 SNR 数量级增加，即使在存在强噪声的情况下也能实现量子通信，否则会因以下原因阻止量子操作噪音纠缠猝死。虽然近年来人们对长距离量子通信产生了巨大的兴趣和进步，但之前处理噪声的尝试主要集中在量子通道中的被动噪声抑制上。在这里，通过使用超纠缠自由度，我们为普遍采用的策略铺平了道路，以通过强噪声量子通道实现基于纠缠的量子通信。