  The 'disentanglement eraser' or 'entanglement restorer' scheme allows
retrieving entanglement by erasing the information about the formation of a
classical (or separable) state. It suggests an analogy between the pairs of
properties: entangled-separable and wave-particle, the latter as described in
the 'quantum eraser'. The scheme illustrates the physical importance of
information in quantum systems, and it is also useful as a building block for
quantum computation. An optical setup for its simple implementation using
three-photon decay in a centro-symmetrical crystal is proposed.
