Many-body protected entanglement generation in interacting spin systems

Details Many-body protected entanglement generation in interacting spin systems Many-body protected entanglement generation in interacting spin systems

2007-06-22

arxiv.org/abs/0706.3378v2

Physics

Condensed Matter

Other Condensed Matter

11 pages, 7 figures. This paper is a longer version of the paper cond-mat/0703108

Scientific paper

10.1103/PhysRevA.77.052305

We discuss a method to achieve decoherence resistent entanglement generation in two level spin systems governed by gapped and multi-degenerate Hamiltonians. In such systems, while the large number of degrees of freedom in the ground state levels allows to create various quantum superpositions, the energy gap prevents decoherence. We apply the protected evolution to achieve decoherence resistent generation of many particle GHZ states and show it can significantly increase the sensitivity in frequency spectroscopy. We discuss how to engineer the desired many-body protected manifold in two specific physical systems, trapped ions and neutral atoms in optical lattices, and present simple expressions for the fidelity of GHZ generation under non-ideal conditions.

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