论文标题

噪声和耐损失的量子转向

Noise-Robust and Loss-Tolerant Quantum Steering with Qudits

论文作者

Srivastav, Vatshal, Valencia, Natalia Herrera, McCutcheon, Will, Leedumrongwatthanakun, Saroch, Designolle, Sébastien, Uola, Roope, Brunner, Nicolas, Malik, Mehul

论文摘要

坚固且无条件安全的量子网络的主要要求是在现实的通道上建立量子非局部相关性。虽然无漏洞的非局部性测试允许在这种与设备无关的环境中进行纠缠认证,但它们对损失和噪声极为敏感,在任何实际的通信场景中,这种损失和噪声自然都会出现。量子转向通过以不对称方式重新构图来放松贝尔非本地性的严格技术约束,从而为可以在现实条件下运行的单方面独立量子网络提供基础。在这里,我们介绍了针对单个检测器测量的量子转向的噪声和耐损耗测试,该测量可利用高维纠缠的优势。我们通过实验证明了通过同时损失和噪声条件对应于14.2 dB损失,相当于79 km的电信纤维,而白噪声的36%,我们通过实验证明了53个维度的检测漏洞量子转向,以实验证明了对基于Qubit的系统的改进,并在53个维度中进行了改进。我们继续展示了高维的使用如何违反直觉的方式导致总测量时间的急剧减少,从而使量子转向违规几乎通过将希尔伯特空间维度加倍而获得的速度更快地获得了两个数量级。通过超越对纠缠不依赖设备的分布所施加的约束,我们容忍损失,噪音和资源有效的量子转向的演示证明了自己是使长距离内无独立的量子通信的关键成分。

A primary requirement for a robust and unconditionally secure quantum network is the establishment of quantum nonlocal correlations over a realistic channel. While loophole-free tests of Bell nonlocality allow for entanglement certification in such a device-independent setting, they are extremely sensitive to loss and noise, which naturally arise in any practical communication scenario. Quantum steering relaxes the strict technological constraints of Bell nonlocality by re-framing it in an asymmetric manner, thus providing the basis for one-sided device-independent quantum networks that can operate under realistic conditions. Here we introduce a noise-robust and loss-tolerant test of quantum steering designed for single detector measurements that harnesses the advantages of high-dimensional entanglement. We showcase the improvements over qubit-based systems by experimentally demonstrating detection loophole-free quantum steering in 53 dimensions through simultaneous loss and noise conditions corresponding to 14.2 dB loss equivalent to 79 km of telecommunication fibre, and 36% of white noise. We go on to show how the use of high dimensions counter-intuitively leads to a dramatic reduction in total measurement time, enabling a quantum steering violation almost two orders of magnitude faster obtained by simply doubling the Hilbert space dimension. By surpassing the constraints imposed upon the device-independent distribution of entanglement, our loss-tolerant, noise-robust, and resource-efficient demonstration of quantum steering proves itself a critical ingredient for making device-independent quantum communication over long distances a reality.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源