AN OPERATIONAL ANALYSIS OF QUANTUM ERASER AND DELAYED CHOICE

In the present paper Ive expand upon ideas published some time ago in connection with which path detectors based on the micromaser. Frequent ly questions arise concerning the time ordering of detection and erase r events. We here show, by a detailed and careful analysis of a quantu m eraser experimental setup, that the experimenter can choose to ascer tain particle-like which path information or wavelike interference inf ormation even after the atom has hit the screen.