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.

arXiv:quant-ph/9808007Physical Review AAug 1, 199927 citations

Quantum Eraser Using a Modified Stern-Gerlach Setup

Tabish Qureshi, Zini Rahman

We propose a new setup to demonstrate quantum eraser, using spin-1/2 particles in a modified Stern-Gerlach setup, with a double slit. The which-way information can be erased simply by applying a transverse magnetic field with an additional magnet, resulting in the emergence of two complementary staggered interference patterns. Use of the classic Stern-Gerlach setup, and the unweaving of the washed out interference without any coincident counting, is what makes this proposal novel.

arXiv:quant-ph/0501010Progress of Theoretical PhysicsJan 1, 20129 citations