论文标题
分布式量子传感的现场演示无选择后传感
Field demonstration of distributed quantum sensing without post-selection
论文作者
论文摘要
分布式量子传感可以为传感的空间分布参数提供超出射击量极限（SNL）以外的量子增强灵敏度。迄今为止，分布式量子传感实验主要是在实验室环境中完成的，而传感器的真实空间分离。另外，通常假定选择后表明对SNL的灵敏度优势。在这里，我们在现场演示了分布式的量子传感，并显示了240 m的场距离的无条件违规（没有后选择后），高达0.916 dB。该成就是基于无漏洞的铃铛测试设置，该设置的平均发音效率为73.88％。此外，为了测试现实生活中的量子传感，我们演示了长距离（带10公里纤维）的实验，以及完全随机和未知参数的传感。结果代表了朝着实用的量子传感网络迈出的重要一步。
Distributed quantum sensing can provide quantum-enhanced sensitivity beyond the shot-noise limit (SNL) for sensing spatially distributed parameters. To date, distributed quantum sensing experiments have been mostly accomplished in laboratory environments without a real space separation for the sensors. In addition, the post-selection is normally assumed to demonstrate the sensitivity advantage over the SNL. Here, we demonstrate distributed quantum sensing in field and show the unconditional violation (without post-selection) of SNL up to 0.916 dB for the field distance of 240 m. The achievement is based on a loophole free Bell test setup with entangled photon pairs at the averaged heralding efficiency of 73.88%. Moreover, to test quantum sensing in real life, we demonstrate the experiment for long distances (with 10-km fiber) together with the sensing of a completely random and unknown parameter. The results represent an important step towards a practical quantum sensing network for widespread applications.
