Extraction of Pure Entangled States from Many Body Systems by Distant Local Projections

Details Extraction of Pure Entangled States from Many Body Systems by Distant Local Projections Extraction of Pure Entangled States from Many Body Systems by Distant Local Projections

2009-03-26

arxiv.org/abs/0903.4553v1

Phys. Rev. A 79, 062310 (2009)

Physics

Quantum Physics

7 pages, 5 figures. Comments welcome

Scientific paper

10.1103/PhysRevA.79.062310

We study the feasibility of extracting a pure entangled state of non-complementary, and potentially well separated, regions of a quantum many-body system. It is shown that this can indeed be accomplished in non-equilibrium scenarios as well as the ground state of the considered spin chain models when one locally measures observables such as magnetization in separated blocks of spins. A general procedure is presented, which can search for the optimal way to extract a pure entangled state through local projections. Our results indicate a connection of the projective extraction of entanglement to good quantum numbers of the underlying Hamiltonian.

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