Delayed Choice Quantum Eraser and Backward Time Telegram

该计划的实质是利用光电实验装置研究量子测量中的跨时效应。该项目的目标是实现一个基于“延迟选择量子擦除器”实验装置的“向后时间电报”的想法。由“0“和“1“组成的电报码或比特串应用于光开关的主动控制，以进行“哪条路径”或“两条路径”的“延迟选择”。光量子的类粒子或类波行为，分别对应于代码“0”或代码“1”，甚至在代码生成之前，将在更早的时间内被记录。代码可以被认为是一个消息，一串要发送的比特。这个“反向时间电报”的工作原理可以被证明。这个项目将扩展PI以前的一个实验，题为“延迟选择量子擦除器”，报告在物理评论快报，第84卷，第1期，2000年。这一新的扩展将澄清先前结果的替代可能的解释，从而向更深入地理解跨时效应在量子场论测量过程中的作用迈出了重要的一步。量子信息科学（QIS）最近的工作已经证明了测量过程的重要性，特别是在宏观和微观现象之间的界面方面。从长远来看，更好地理解该接口对于更好地理解QIS和量子计算新兴领域的设计空间可能非常重要。

The essence of this program is to investigate intertemporal effects in quantum measurements utilizing an optoelectronic experimental setup. The goal of the project is to realize an idea identified as a "backward time telegram" based on the experimental setup of the "delayed choice quantum eraser". A telegram code, or a string of bits, consisting of "0"s and "1"s shall be used for active control of an optical switch to make the "delayed choice" of "which-path" or "both-paths". The particle-like or wave-like behavior of a light quantum, which corresponding to code "0" or code "1" respectively, will be registered in a much early time even before the generation of the code. The code may be considered as a message, a string of bits to be transmitted. The working principle of this "Backward Time Telegram" could then be demonstrated.The project will extend a previous experiment by the PI, entitled "Delayed Choice Quantum Eraser," reported in Physical Review Letters, Vol. 84, No. 1, 2000. This new extension will clarify the alternative possible explanations of the prior results, and thereby take a significant step towards a deeper understanding of the role of intertemporal effects in the process of measurement in quantum field theory.Recent work in quantum information sciences (QIS) has demonstrated the great importance of the measurement process, particularly in regards to the interface between macroscopic and microscopic phenomena. A better understanding of that interface may be very important, in the long-term, to a better understanding of the design space available to the emerging field of QIS and quantum computing.