论文标题
参数估计，具有非铁旋转链的稳态
Parameter estimation with the steady states of non-Hermitian spin chains
论文作者
论文摘要
我们提出了一种以非铁旋转链的稳态为参数估计的方案。要估计的参数通过施加在链的第一个位点上的外部磁场在系统中编码。我们获得了两个位点的自旋链的分析光谱。我们发现，量子Fisher信息（QFI）有关燃烧场的幅度分歧，而QFI围绕方位角角度达到了特殊点的最大值。此外，随着系统尺寸的增加和足够长的自旋链的饱和度，QFI得到了增强，因为仅由燃烧的场诱导短距离相关性。
We propose a scheme for parameter estimation with the steady states of non-Hermitian spin chains. The parameters to be estimated are encoded in the system via the external magnetic field that imposed on the first site of the chain. We obtain the analytical spectrum for the spin chain of two sites. We find that the quantum Fisher information (QFI) about the amplitude of the imposing field diverges while the QFI about the azimuthal angle reaches to the maximum at exceptional points. Moreover, the QFI is enhanced as the system size increasing and saturates for sufficiently long spin chain because only short-range correlations are induced by the imposing field.
