  In this paper we will first look at a particular quantum eraser setup to show
that this type of experiments can be understood in an intuitive manner if we
are willing to take a complex nonlinear approach, without the need to invoke
Niels Bohr's complementarity or quantum entanglement between two particles. We
will then discuss a recent experiment of the same type that does not erase the
interference pattern when which-path information is available, and argue that
this result is in clear contradiction with the orthodox interpretation of
quantum mechanics but perfectly understandable in the framework of nonlinear
quantum physics.
