利用开/关光电探测的二值数据重建量子态
Quantum state reconstruction using binary data from on/off photodetection
摘要：
量子态的密度矩阵的知识在从量子信息处理到以量子力学和量子光学为基础的实验的许多领域中起着基础性的作用。最近，已经提出并实施了一种方法，以便利用仅能够区分光的存在或不存在的实际开/关检测器（例如硅雪崩光电二极管）可获得的信息来获得密度矩阵的对角元素的重构。本文的目的是提供一个概述的理论和实验发展的开/关方法，包括其扩展到整个密度矩阵的重建。
英文摘要：
The knowledge of the density matrix of a quantum state plays a fundamental role in several fields ranging from quantum information processing to experiments on foundations of quantum mechanics and quantum optics. Recently, a method has been suggested and implemented in order to obtain the reconstruction of the diagonal elements of the density matrix exploiting the information achievable with realistic on/off detectors, e.g. silicon avalanche photo-diodes, only able to discriminate the presence or the absence of light. The purpose of this paper is to provide an overview of the theoretical and experimental developments of the on/off method, including its extension to the reconstruction of the whole density matrix.
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