Experimental demonstration of continuous variable quantum erasing
  We experimentally demonstrate the concept of continuous variable quantum erasing. The amplitude quadrature of the signal state is labelled to another state via a quantum nondemolition interaction, leading to a large uncertainty in the determination of the phase quadrature due to the inextricable complementarity of the two observables. We show that by erasing the amplitude quadrature information we are able to recover the phase quadrature information of the signal state. 
Ulrik L. Andersen, Oliver Gl\"ockl, Stefan Lorenz, Gerd Leuchs, Radim   Filip