Delayed choice nonlocal dispersion cancellation 

Nonlocal dispersion cancellation is one of the representative phenomenon
that shows absurd features of entangled particles.
It is known that dispersion of wave packet can be described as  a kind
of "temporal diffraction", and  nonlocal dispersion cancellation
is explained by "two-photon temporal diffraction".
If a quantum state of two photons is generated from three photon energy-time
entangled  state, nonlocal dispersion cancellation can or can't occur depending
on measurement choice of third photon.
This choice can be done even after the two photons are detected.
This phenomenon is explained by " temporal quantum eraser" concept.