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We define a new measurement of entanglement, the entanglement of projection,and find that it is natural to write the entanglements of formation andassistance in terms of it. Our measure allows us to describe a new class ofquantum erasers which restore entanglement rather than just interference. Sucherasers can be implemented with simple quantum computer components. We proposerealistic optical versions of these erasers.Comment: 12pp, 2 figs, LATEX (Revtex

Entanglement of projection and a new class of quantum erasers