Ghost Interference and Quantum Erasure
  The two-photon ghost interference experiment, generalized to the case of massive particles, is theoretically analyzed. It is argued that the experiment is intimately connected to a double-slit interference experiment where, the which-path information exists. The reason for not observing first order interference behind the double-slit, is clarified.It is shown that the underlying mechanism for the appearance of ghost interference is, the more familiar, quantum erasure. 
Pravabati Chingangbam (IIAP, Bangalore), Tabish Qureshi (CTP, JMI, New   Delhi)