Complementarity in temporal ghost interference and temporal quantum eraser

We present a theory for the complementarity in temporal interference and quantum erasure. We consider the case of entangled biphoton where we can get the information of single photon's arrival time without making a disturbing measurement. We find a mathematical equation for the complementary relation for a temporal double slit experiment. We also propose a quantum eraser scheme that will elucidate that the complementarity is originated from the quantum entanglement.