论文标题
延迟选择的量子橡皮擦别无选择
The Delayed-Choice Quantum Eraser Leaves No Choice
论文作者
论文摘要
理论上分析了使用改良的Mach-Zhhnder（MZ）干涉仪和极化纠缠光子的可实现的延迟选择量子橡皮擦。信号光子经过修改的MZ干涉仪，惰轮光子的极化为信号光子提供了路径信息。该设置与维也纳组实验研究的延迟选择量子橡皮擦非常相似。在具有离散输出状态的量子橡皮擦类别中，很容易看到延迟模式对实验者没有任何选择。始终删除哪个通道信息，每个检测到的信号光子都固定了惰轮的极化状态，因此提供了有关信号光子如何遍历这两个路径的准确信息。分析表明，维也纳延迟选择的量子橡皮擦是第一个实验证明，表明延迟模式对实验者没有选择，并且始终删除哪种信息信息。另外，该参数即使在常规的两缝量子擦除器中也存在。屏幕上任何地方注册的每个光子都以独特的相互偏见的方式固定了两态检测器的状态。在延迟选择的量子橡皮擦实验中，到目前为止，互无偏基集的基础集的作用一直被忽略。
A realizable delayed-choice quantum eraser, using a modified Mach-Zehnder (MZ) interferometer and polarization entangled photons, is theoretically analyzed here. The signal photon goes through a modified MZ interferometer, and the polarization of the idler photon provides path information for the signal photon. The setup is very similar to the delayed-choice quantum eraser experimentally studied by the Vienna group. In the class of quantum erasers with discrete output states, it is easy to see that the delayed mode leaves no choice for the experimenter. The which-way information is always erased, and every detected signal photon fixes the polarization state of the idler, and thus gives information on precisely how the signal photon traversed the two paths. The analysis shows that the Vienna delayed-choice quantum eraser is the first experimental demonstration of the fact that the delayed mode leaves no choice for the experimenter, and the which-way information is always erased. Additionally it is shown that this argument holds even in a conventional two-slit quantum eraser. Every photon registered anywhere on the screen, fixes the state of the two-state which-way detector in a unique mutually unbiased basis. In the delayed-choice quantum eraser experiments, the role of mutually unbiased basis sets for the which-way detector, has been overlooked till now.
