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26 papers · 1 filter
Nishimori point in random-bond Ising and Potts models in 2D
A. Honecker, J. L. Jacobsen, M. Picco +1
We study the universality class of the fixed points of the 2D random bond q-state Potts model by means of numerical transfer matrix methods. In particular, we determine the critica…
Entanglement versus Bell violations and their behaviour under local filtering operations
Frank Verstraete, Michael M. Wolf
We discuss the relations between the violation of the CHSH Bell inequality for systems of two qubits on the one side and entanglement of formation, local filtering operations, and…
Violation of Bell's inequalities implies distillability for N qubits
A. Acin, V. Scarani, M. M. Wolf
We consider quantum systems composed of qubits, and the family of all Bell's correlation inequalities for two two-valued measurements per site. We show that if a -qubit stat…
Stabilizer codes can be realized as graph codes
D. Schlingemann
We establish the connection between a recent new construction technique for quantum error correcting codes, based on graphs, and the so-called stabilizer codes: Each stabilizer cod…
Low Energy Singlets in the Excitation Spectrum of the Spin Tetrahedra System Cu_2Te_2O_5Br_2
P. Lemmens, K. Y. Choi, A. Ionescu +8
Low energy Raman scattering of the s=1/2 spin tetrahedra system Cu_2Te_2O_5Br_2 is dominated by an excitation at 18 cm^{-1} corresponding to an energy E_S=0.6Δ, with Δthe spin gap…
Planar pyrochlore: a strong-coupling analysis
Wolfram Brenig, Andreas Honecker
Recent investigations of the two-dimensional spin-1/2 checkerboard lattice favor a valence bond crystal with long range quadrumer order [J.-B. Fouet et al., preprint cond-mat/01080…