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Distributed quantum sensing with mode-entangled spin-squeezed atomic states
Nature ( IF 64.8 ) Pub Date : 2022-11-23 , DOI: 10.1038/s41586-022-05363-z
Benjamin K Malia 1, 2 , Yunfan Wu 3 , Julián Martínez-Rincón 1, 4 , Mark A Kasevich 1, 3
Affiliation  

Quantum sensors are used for precision timekeeping, field sensing and quantum communication1,2,3. Comparisons among a distributed network of these sensors are capable of, for example, synchronizing clocks at different locations4,5,6,7,8. The performance of a sensor network is limited by technical challenges as well as the inherent noise associated with the quantum states used to realize the network9. For networks with only spatially localized entanglement at each node, the noise performance of the network improves at best with the square root of the number of nodes10. Here we demonstrate that spatially distributed entanglement between network nodes offers better scaling with network size. A shared quantum nondemolition measurement entangles a clock network with up to four nodes. This network provides up to 4.5 decibels better precision than one without spatially distributed entanglement, and 11.6 decibels improvement as compared to a network of sensors operating at the quantum projection noise limit. We demonstrate the generality of the approach with atomic clock and atomic interferometer protocols, in scientific and technologically relevant configurations optimized for intrinsically differential comparisons of sensor outputs.



中文翻译:

具有模式纠缠自旋压缩原子态的分布式量子传感

量子传感器用于精确计时、场传感和量子通信1,2,3。这些传感器的分布式网络之间的比较能够,例如,同步不同位置4,5,6,7,8的时钟。传感器网络的性能受到技术挑战以及与用于实现网络9的量子态相关的固有噪声的限制。对于在每个节点处仅具有空间局部纠缠的网络,网络的噪声性能最多随着节点数的平方根10而提高. 在这里,我们证明了网络节点之间的空间分布纠缠提供了更好的网络规模缩放。一个共享的量子非破坏性测量将一个时钟网络与最多四个节点纠缠在一起。与没有空间分布纠缠的网络相比,该网络的精度提高了 4.5 分贝,与在量子投影噪声极限下运行的传感器网络相比,精度提高了 11.6 分贝。我们展示了原子钟和原子干涉仪协议方法的普遍性,在科学和技术相关配置中针对传感器输出的本质差分比较进行了优化。

更新日期:2022-11-25
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