论文标题
分布式量子传感，具有自旋式原子状态的模式键入网络
Distributed quantum sensing with a mode-entangled network of spin-squeezed atomic states
论文作者
论文摘要
量子传感器用于精确定时管理，场传感和量子通信。这些传感器的分布式网络之间的比较能够，例如在不同位置同步时钟。传感器网络的性能受到技术挑战的限制以及与用于实现网络的量子状态相关的固有噪声。对于仅在每个节点处具有本地纠缠的网络，网络的噪声性能最多可以通过节点数量的平方根来提高。在这里，我们证明了网络节点之间的非本地纠缠可通过网络大小进行更好的扩展。共享的量子非约束测量纠缠了一个最多四个节点的时钟网络。与在量子投影噪声限制下运行的传感器网络相比，该网络提供的精度高达4.5 dB的精度，而没有非本地纠缠的网络则提供11.6 dB的改进。我们在科学和技术相关的配置方面通过原子钟和原子干涉仪协议进行了方法的通用性，以优化传感器输出的本质差异比较。
Quantum sensors are used for precision timekeeping, field sensing, and quantum communication. Comparisons among a distributed network of these sensors are capable of, for example, synchronizing clocks at different locations. 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 network. For networks with only local entanglement at each node, the noise performance of the network improves at best with square root of the number of nodes. Here, we demonstrate that nonlocal 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 dB better precision than one without nonlocal entanglement, and 11.6 dB 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.
