Realization of the which-path detector and quantum eraser through the Raman atom–field interaction

We propose a method to realize the which-path detector in a double-slit atomic interferometer. We place a cavity, initially in a coherent state with a strong amplitude, in front of one slit. The which-path information is obtained by a degenerate Raman atom–cavity-field interaction. The associated quantum eraser can also be realized.