Quantum metrology in different environments and its experimental verification by quantum simulation
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摘要: 量子精密测量利用量子纠缠和量子相干性提高测量精度．本文简要回顾了在各种噪声环境中的量子精密测量方案，包括非马尔科夫噪声、关联噪声、双光子噪声环境等等．另外，量子信息的蓬勃发展让我们能够设计和利用相应的量子模拟实验，从而检验各种量子精密测量理论方案的实验可行性．Abstract: Quantum metrology based on quantum entanglement and quantum coherence improves the accuracy of measurement. In this paper, we briefly review the schemes of quantum metrology in various complex environments, including non-Markovian noise, correlated noise, two-photon relaxation. On the other hand, the booming development of quantum information allows us to utilize quantum simulation experiments to test the feasibility of various theoretical schemes and demonstrate the rich physical phenomena in different baths.
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图 3 发生单光子耗散时，（a）不同耦合强度下，
$ g $ 方差的倒数$ {F}_{g}\left(t\right) $ 随时间的演化；（b）$ {F}_{g}\left(t\right) $ 最大值与能隙关系[15]．
图 4 发生单光子耗散时，不同温度下，
$ g $ 方差的倒数$ {F}_{g}\left(t\right) $ 随时间的演化（a）；$ {F}_{g}\left(t\right) $ 最大值与温度关系（b）[15]．
图 5 发生双光子耗散时，不同耦合强度下，
$ g $ 方差的倒数$ {F}_{g}\left(t\right) $ 随时间的演化（a）；$ {F}_{g}\left(t\right) $ 最大值与能隙关系（b）[15]．
图 7 用束缚态和Floquet工程克服量子精密测量的止步定理（左一）Floquet工程示意图,（左二）总系统能谱中能带和束缚态与驱动强度A关系，（左三）Fisher信息动力学与驱动强度A关系，（右一）Fisher信息与时间关系 [20].
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