Quantum Eraser for Three-Slit Interference
  It is well known that in a two-slit interference experiment, if the information, on which of the two paths the particle followed, is stored in a quantum path detector, the interference is destroyed. However, in a setup where this path information is "erased", the interference can reappear. Such a setup is known as a quantum eraser. A generalization of quantum eraser to a three-slit interference is theoretically analyzed. It is shown that three complementary interference patterns can arise out of the quantum erasing process. 
Naveed Ahmad Shah, Tabish Qureshi (Centre for Theoretical Physics,   JMI, Delhi)
quant-ph