Measurement-based quantum computation in a 2D phase of matter

Details Measurement-based quantum computation in a 2D phase of matter Measurement-based quantum computation in a 2D phase of matter

2011-08-24

arxiv.org/abs/1108.4741v2

New J. Phys. 14, 013023 (2012)

Physics

Quantum Physics

8 pages, 6 figures, comments welcome. v2: published version

Scientific paper

10.1088/1367-2630/14/1/013023

Recently it has been shown that the non-local correlations needed for measurement based quantum computation (MBQC) can be revealed in the ground state of the Affleck-Kennedy-Lieb-Tasaki (AKLT) model involving nearest neighbor spin-3/2 interactions on a honeycomb lattice. This state is not singular but resides in the disordered phase of ground states of a large family of Hamiltonians characterized by short-range-correlated valence bond solid states. By applying local filtering and adaptive single particle measurements we show that most states in the disordered phase can be reduced to a graph of correlated qubits that is a scalable resource for MBQC. At the transition between the disordered and Neel ordered phases we find a transition from universal to non-universal states as witnessed by the scaling of percolation in the reduced graph state.

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