POVM测量在量子反馈控制中的应用

项目名称： POVM测量在量子反馈控制中的应用

项目编号： No.11247006

项目类型： 专项基金项目

立项/批准年度： 2013

项目学科： 物理学II

项目作者： 肖兴

作者单位： 赣南师范学院

项目金额： 20万元

中文摘要： 量子测量是研究量子信息和量子力学基本问题的基础。正值算符测量(positive operator valued measurement, or POVM) 作为量子测量的一个重要研究方向，具有丰富的物理性质和广阔的应用前景。我们将POVM应用到量子反馈控制领域，系统地研究POVM测量的独特性质（非完全破坏性，可恢复性，强度可调等）对量子反馈控制的影响，设计出基于POVM测量的量子反馈控制方案来抑制量子退相干，保护量子纠缠和量子discord以及实现量子纠错。然后与基于von Neumann投影测量的量子反馈控制方案对比，讨论基于POVM测量的量子反馈控制方案的优越性。检验不同的系统初态，不同的噪声类型对这种优越性的影响，并进而研究POVM测量反馈控制方案的优越性和POVM测量的可恢复性之间的内在关系。我们的研究将为实验中如何利用量子反馈控制的方法抑制退相干提供理论依据和新的实验途径。

中文关键词： POVM 测量；量子反馈控制；量子纠缠；量子计量；

英文摘要： Quantum measurement is the foundation of quantum information and some fundamental problems in quantum mechanics. As an improtant subordinate research field of quantum measurement, positive operator valued measurement(POVM) has plenty of physical characteristics and wide applications. We introduce POVM measurement into quantum feedback control and systematically investigate the influences of POVM''s typical characteristics on quantum feedback control, such as non-destructive, recoverability and controllability. Based on POVM measurement, we will propose some quantum feedback control strategies to supress quantum decoherence, protect quantum entanglement or quantum discord and implement quantum error correction. Then, we contrast these approaches with the strategies that based on von Neumann projective measurement and discuss the advantages of POVM measurement-based feedback control schemes. By examining different initial states and different types of noises, we will demonstrate that how these factors affect the optimality of POVM measurement-based feedback control schemes. After the above research, we will further explore the intrinsical relationship between the optimality and the recoverability of POVM measurement. Our research will provide some theoretical evidences and new experimental schemes for decoherence

英文关键词： POVM measure；quantum feedback control；quantum entanglement；quantum metrology；