Distributed Quantum Sensing Network with Geographically Constrained Measurement Strategies
Distributed Quantum Sensing Network with Geographically Constrained Measurement Strategies
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DOI：
10.1109/icassp49357.2023.10096723
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
Yingkang Cao;Xiaodi Wu
中科院分区：
文献类型：
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作者：
Yingkang Cao;Xiaodi Wu
与可分离探针相比，利用纠缠探针可以提高分布式量子传感网络估计局部参数的全局函数的精度。这种优势通常被描述为量子克拉美-拉奥界限（QCRB）的二次改进。这个论点是不完整的，因为QCRB假设了一组全能的传感器，可以执行量子力学允许的任意联合测量。一个直接的问题是，这种优势是否持续孤立的传感器与物理激励的限制，在他们的测量策略。在本文中，我们首先考虑本地操作和经典的通信（LOCC）策略，并证明QCRB确实是渐近可达的任意纯探测状态，通过扩展以前的工作单参数估计[1]。我们进一步数值分析了一个更受限制的情况下，传感器只能进行独立的本地测量，并提供证据表明，QCRB是不够的信息比较不同的探针状态。
Distributed quantum sensing network has the potential of enhancing the precision in estimating a global function of local parameters by utilizing an entangled probe, compared with that achieved with separable probes. This advantage is often characterized as a quadratic improvement of the quantum Cramér-Rao bound (QCRB). This argument is incomplete in that QCRB assumes a team of all-powerful sensors that can perform arbitrary joint measurements allowed by quantum mechanics. An immediate question arises as to whether such an advantage persists for isolated sensors with physically motivated constraints in their measurement strategies. In this paper, we first consider local operations and classical communication (LOCC) strategies and prove that the QCRB is indeed asymptotically attainable for arbitrary pure probe states, by extending previous work on single-parameter estimation [1]. We further numerically analyze a more restricted scenario where the sensors can only make independent local measurements, and provide evidence that the QCRB is not informative enough for comparing different probe states.