Characterizing Quantum Properties of a Measurement Apparatus: Insights from the Retrodictive Approach
Characterizing Quantum Properties of a Measurement Apparatus: Insights from the Retrodictive Approach
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DOI：
10.1103/physrevlett.106.020502
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发表时间：
2011-01-11
影响因子：
8.6
通讯作者：
Fabre, Claude
中科院分区：
文献类型：
--
作者：
Amri, Taoufik;Laurat, Julien;Fabre, Claude
使用量子物理学的追溯方法，我们证明从测量设备的响应中追溯的状态是充分表征其量子特性的便捷工具。我们根据这种状态来解释探测器量子行为的一些有趣方面，例如其测量的非经典性或非高斯特征。我们还介绍了直接从追溯方法得出的估计量——设备执行的测量的投影率、理想性、保真度或探测率。除了描述一般量子测量的基本意义之外，这些属性在多种协议中也至关重要，特别是在非经典光态的条件准备或测量驱动的量子信息处理中。
Using the retrodictive approach of quantum physics, we show that the state retrodicted from the response of a measurement apparatus is a convenient tool to fully characterize its quantum properties. We translate in terms of this state some interesting aspects of the quantum behavior of a detector, such as the nonclassicality or the non-Gaussian character of its measurements. We also introduce estimators-the projectivity, the ideality, the fidelity, or the detectivity of measurements performed by the apparatus-which directly follow from the retrodictive approach. Beyond their fundamental significance for describing general quantum measurements, these properties are crucial in several protocols, in particular, in the conditional preparation of nonclassical states of light or in measurement-driven quantum information processing.