论文标题
PT对称腔磁化系统中的参数估计和量子纠缠系统
Parameter estimation and quantum entanglement in PT symmetrical cavity magnonics system
论文作者
论文摘要
我们研究了镁含量 - 磁通耦合系统中的参数估计。 PT对称两个元音系统可以通过绝热消除腔场模式在增益磁性材料中形成。我们表明，由于量子波动在特殊点最强，因此最佳估计不会出现在特殊点。此外，我们证明，随着准备时间的增加，特殊点的测量值往往是最佳的。直接光子检测是真空输入状态下初始状态的最佳测量。对于开放的PT对称两个元音系统，量子波动将大大降低纠缠程度。最后，我们表明，可以通过测量Pt对称两个磁子系统中的一根镁的频率来获得更高的估计磁灵敏度。
We investigate the parameter estimation in a magnon-cavity-magnon coupled system. PT symmetrical two magnons system can be formed in the gain magnetic materials by the adiabatic elimination of the cavity field mode. We show that the optimal estimation will not appear at the exceptional point due to that the quantum fluctuations are the strongest at the exceptional point. Moreover, we demonstrate that the measurements at the exceptional point tend to be optimal with the increase of prepared time. And the direct photon detection is the optimal measurement for the initial state in the vacuum input state. For the open PT symmetrical two magnons system, the quantum fluctuations will greatly reduce the degree of entanglement. Finally, we show that a higher estimated magnetic sensitivity can be obtained by measuring the frequency of one magnon in the PT symmetrical two magnons system.
