Delayed Choice Quantum Eraser and Backward Time Telegram

该计划的实质是利用光电子实验装置研究量子测量中的跨期效应。该项目的目标是实现一个被确定为“倒计时电报”的想法，该想法是基于“延迟选择量子橡皮擦”的实验装置。对光开关进行主动控制时，应使用由S和S组成的报文代码或比特串，以“延迟选择”“哪一条路径”或“两条路径”。光量子的粒子状或波状行为，分别对应于代码“0”或代码“1”，甚至在代码生成之前就会被记录下来。该代码可以被认为是要发送的消息、比特串。这个“反向时间电报”的工作原理可以被证明。该项目将扩展PI以前的一个实验，名为“延迟选择量子橡皮擦”，发表在物理评论快报，第84卷，第1期，2000年第1期。这一新的扩展将阐明对先前结果的其他可能解释，从而朝着更深入地理解跨期效应在量子场论中测量过程中的作用迈出重要的一步。最近在量子信息科学(QIS)中的工作已经证明了测量过程的重要性，特别是关于宏观和微观现象之间的界面。从长远来看，更好地理解这种接口对于更好地理解QIS和量子计算新兴领域可用的设计空间可能是非常重要的。

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.