自旋-力学辅助磁强计中通过后选择实现相位信息传递
Phase information transfer by post-selection in Spin--Mechanical assisted magnetometry
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中文总结 AI 辅助
本研究利用自旋-力学系统，通过对自旋系统后选择的选择性反作用实现相位信息传递，为量子磁强计提供了分析框架。
中文摘要 AI 辅助
光-物质型系统间的量子信息传递有望实现重要应用，同时也可作为理论研究的测试平台，这类系统可由耦合至机械振荡器的自旋实现，该平台已在理论和实验上被广泛研究。早期量子信息传递的演示主要依赖相干控制，而测量诱导的反作用已成为量子控制的有力替代方案。本研究中，我们对自旋系统进行后选择，将其作为选择性反作用，以将自旋的相位信息重新聚焦到机械振荡器上。我们确定了调控条件相位传递的物理资源和工作区域，包括振荡器量子相干性、自旋数量、机械初始状态、耦合强度、振荡器振幅以及弛豫过程。我们以方差作为性能指标，通过两种互补方法对不同场景进行基准测试：半经典方差估计器和Pegg-Barnett量子估计器，同时计算了克拉美罗界（Cramér-Rao bound）用于对比。该分析为理解高维混合量子系统中的相位传递以及用于量子磁强计的测量诱导反作用提供了框架。
英文摘要
Quantum information transfer between light-matter-type systems is poised to enable important applications, while also serving as a testbed for theoretical investigation. Such systems can be realized with spins coupled to a mechanical oscillator, a platform that has been extensively studied both theoretically and experimentally. Early demonstrations of quantum information transfer have relied mostly on coherent control. However, measurement-induced backaction has emerged as a strong alternative for quantum control. In this work we use post-selection on the spin system as a selective backaction to refocus spin's phase information onto the mechanical oscillator. We identify physical resources and operating regimes that govern conditional phase transfer, including oscillator quantum coherence, the number of spins, the mechanical initial state, coupling strength, oscillator amplitude, and relaxation. We benchmark different scenarios using the variance as the figure of merit, estimated via two complementary approaches: a semiclassical variance estimator and a Pegg-Barnett quantum estimator. The Cramér-Rao bound is also computed for comparison. The analysis provides a framework for understanding phase transfer in high-dimensional hybrid quantum systems and for measurement-induced backaction used in quantum magnetometry.
