论文标题
打破与非马克维亚记忆效应的量子cramér-rao
Breaking the quantum Cramér-Rao bound with non-Markovian memory effects
论文作者
论文摘要
线性光学器件提供了模拟和控制开放量子系统动力学的多功能手段。在这里，光子的极化和频率通常代表系统及其环境。最近，也考虑了光子的自由度和干扰的影响，从而产生了“开放系统干扰”的概念。在某些情况下，此类模型已显示可击败传统的参数估计方案。在这项工作中，我们研究了由开放式系统MACH-ZEHNDER干涉仪引起的非马克维亚记忆效应的敏感性。我们的协议提供了一种围绕量子cramér-rao定理的替代方法，证明自己是更常规的参数估计协议的值得注意的选择。
Linear optics provides versatile means to simulate and control the dynamics of open quantum systems. Here, the polarization and frequency of photons often represent the system and its environment, respectively. Recently, the photon's path degree of freedom and the effects of interference have been considered as well, giving rise to the concept of "open system interference". Such models have been shown to beat traditional parameter estimation schemes in certain scenarios. In this work, we study the sensitivity of non-Markovian memory effects arising from an open system Mach-Zehnder interferometer. Our protocol provides an alternative way to get around the quantum Cramér-Rao theorem, proving itself a noteworthy option for more conventional parameter estimation protocols.
