Quantum Properties of a Which-Way Detector

We explore quantum properties of a which-way detector using three versions of an idealized two slit arrangement. First, we derive complementarity relations for the detector; second, we show how the 'experiment' may be altered in such a way that using a single-position measurement on the screen, we can obtain quantum erasure. Finally, we show how to construct a superposition of 'wave' and 'particle' components.