论文标题
在耗散环境下对量子光学计量学对量子光学计量的影响
Non-Markovian effect on quantum optical metrology under dissipative environment
论文作者
论文摘要
量子计量学利用量子效应来达到与经典同行相比的更高精度测量。但是，普遍存在的脱碳阻碍了其应用。最近，在局部耗散环境下\ cite {physRevlett.123.040402}下，非马克维亚效应在执行量子光学计量方面有效。但是，该机制仍然相当朦胧。在这里，我们揭示了形成约束状态可以通过纠缠相干状态的量子渔民信息来保护量子的原因。得出了长期编码时间条件下量子渔民信息的精确分析表达，这表明精确的动力学可以在平均光子数较小时渐近地到达理想案例促进的动态。同时，随着平均光子数量的增加，缩放率表现出从弱的海森堡极限到次级经典极限的过渡。我们的工作提供了一种配方，可以利用非马克维亚效应在存在噪声的情况下实现超敏度测量。
Quantum metrology utilizes quantum effects to reach higher precision measurements of physical quantities compared with their classical counterparts. However the ubiquitous decoherence obstructs its application. Recently, non-Markovian effects are shown to be effective in performing quantum optical metrology under locally dissipative environments\cite{PhysRevLett.123.040402}. However, the mechanism is still rather hazy. Here, we uncover the reason why forming a bound state can protect the quantumness against a dissipative ambient via the quantum Fisher information of entangled coherent states. An exact analytical expression of the quantum Fisher information in the long-encoding-time condition is derived, which reveals that the dynamics of precision can asymptotically reach the ideal-case-promised one easily when the average photon number is small. Meanwhile, the scaling exhibits a transition from the weak Heisenberg limit to the sub-classical limit with the increase of average photon number. Our work provides a recipe to realize ultrasensitive measurements in the presence of noise by utilizing non-Markovian effects.
