混合量子态的参数估计
Parameter estimation with mixed quantum states
摘要：
我们考虑初始混合态的量子增强测量。我们表明，非常普遍的是，对于任何线性传播的初始状态，取决于平稳的参数估计，灵敏度是由最大的灵敏度，可以实现任何的纯态的初始密度矩阵混合。这提供了一个非常普遍的证明，纯粹的经典相关不能提高量子增强测量方案中参数估计方案的灵敏度。
英文摘要：
We consider quantum enhanced measurements with initially mixed states. We show very generally that for any linear propagation of the initial state that depends smoothly on the parameter to be estimated, the sensitivity is bound by the maximal sensitivity that can be achieved for any of the pure states from which the initial density matrix is mixed. This provides a very general proof that purely classical correlations cannot improve the sensitivity of parameter estimation schemes in quantum enhanced measurement schemes.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
