Entanglement of projection and a new class of quantum erasers

Phys. Rev. A 60, 827 – Published 1 August 1999
Robert Garisto and Lucien Hardy


We define a new measurement of entanglement, the entanglement of projection, and find that it is natural to write the entanglements of formation and assistance in terms of it. Our measure allows us to describe a new class of quantum erasers which restore entanglement rather than just interference. Such erasers can be implemented with simple quantum computer components. We propose realistic optical versions of these erasers.

DOI: http://dx.doi.org/10.1103/PhysRevA.60.827

  • Received 26 August 1998
  • Published in the issue dated August 1999

© 1999 The American Physical Society

Authors & Affiliations

Robert Garisto

  • BNL Theory Group, Building 510a, Brookhaven National Laboratory, Upton, New York 11973

Lucien Hardy

  • Clarendon Laboratory, Oxford OX1 3PU, England

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