Networked quantum sensing
Networked quantum sensing
复制标题
网络化量子传感
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
J. Dunningham
中科院分区：
文献类型：
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作者：
T. Proctor;P. Knott;J. Dunningham
我们介绍了一个通用的量子传感器网络模型，我们用这个模型来考虑的问题：当量子传感器之间的相关性（量子或经典）提高网络可以测量一组未知的参数的精度？我们严格回答这个问题的一系列实际重要的问题。当网络中的每个传感器测量单个参数时，我们表明传感器之间的相关性不能增加估计精度，超出了不相关方案可以实现的估计精度，无论所讨论的估计问题的具体细节如何。我们还考虑了更一般的设置，其中每个传感器可以用于测量多个参数，例如，磁场的三个空间分量在这种情况下，我们表明，传感器之间的相关性只能提供，在最好的情况下，一个小的恒定的精度提高，在不相关的估计技术。最后，我们考虑优化网络以测量未知参数的单个线性函数，例如，所有参数的平均值。在这里，传感器之间的量子相关性可以提供相对于不相关技术的显著精度增强，并且该增强因子与传感器的数量成比例。为了说明这项工作的广泛影响，我们将我们的研究结果应用到广泛的实际感兴趣的估计问题，包括多模光学干涉，原子传感器网络和时钟网络。我们的研究结果揭示了文献中的一些结果，为未来网络化量子传感器的研究提供了一个严格的总体框架，并对量子多参数估计理论和量子传感技术产生了影响。
We introduce a general model for a network of quantum sensors, and we use this model to consider the question: when do correlations (quantum or classical) between quantum sensors enhance the precision with which the network can measure an unknown set of parameters? We rigorously answer this question for a range of practically important problems. When each sensor in the network measures a single parameter, we show that correlations between sensors cannot increase the estimation precision beyond what can be achieved with an uncorrelated scheme, regardless of the particular details of the estimation problem in question. We also consider the more general setting whereby each sensor may be used to measure multiple parameters, e.g., the three spatial components of a magnetic field. In this case, we show that correlations between sensors can only provide, at best, a small constant precision enhancement, over uncorrelated estimation techniques. Finally, we consider optimizing the network for measuring a single linear function of the unknown parameters, e.g., the average of all of the parameters. Here quantum correlations between the sensors can provide a significant precision enhancement over uncorrelated techniques, and this enhancement factor scales with the number of sensors. To illustrate the broad implications of this work, we apply our results to a wide range of estimation problems of practical interest, including multi-mode optical interferometry, networks of atomic sensors, and networks of clocks. Our findings shed light on a number of results in the literature, provide a rigorous general framework for future research on networked quantum sensors, and have implications for both quantum multi-parameter estimation theory, and quantum sensing technologies.
影响因子：
5.7
作者：
Wang, Yazhen
通讯作者：
Wang, Yazhen