论文标题
按时间分辨的单光子计数对时间键qudit的阶段估计
Phase estimation of time-bin qudits by time-resolved single-photon counting
论文作者
论文摘要
我们提出了通过纤维发送的量子状量量量子层析成像（QST）的综合框架。从基本假设开始，我们定义了一个正面值的度量（POVM），然后将其应用于量子状态重建问题。在将检测器的时间不确定性视为实验噪声的来源时，考虑了一种现实的情况。通过针对描述该设备的不同参数进行的一系列数值模拟来检查量子断层扫描框架的性能。通过最低限制的概念量化的状态回收质量在图形上显示了一系列纤维长度。特别注意量子和Qutrits的相对相重建。结果呈现纤维长度和检测器抖动之间的相关相互依赖性。
We present a comprehensive framework for quantum state tomography (QST) of time-bin qudits sent through a fiber. Starting from basic assumptions, we define a positive-operator valued measure (POVM) which is then applied to the quantum state reconstruction problem. A realistic scenario is considered where the time uncertainty of the detector is treated as a source of experimental noise. The performance of the quantum tomography framework is examined through a series of numerical simulations conducted for different parameters describing the apparatus. The quality of state recovery, quantified by the notion of minimum fidelity, is depicted on graphs for a range of fiber lengths. Special attention is paid to relative phase reconstruction for qubits and qutrits. The results present relevant interdependence between the fiber length and the detector jitter.
