373 research outputs found
Non-locality of non-Abelian anyons
Topological systems, such as fractional quantum Hall liquids, promise to
successfully combat environmental decoherence while performing quantum
computation. These highly correlated systems can support non-Abelian anyonic
quasiparticles that can encode exotic entangled states. To reveal the non-local
character of these encoded states we demonstrate the violation of suitable Bell
inequalities. We provide an explicit recipe for the preparation, manipulation
and measurement of the desired correlations for a large class of topological
models. This proposal gives an operational measure of non-locality for anyonic
states and it opens up the possibility to violate the Bell inequalities in
quantum Hall liquids or spin lattices.Comment: 7 pages, 3 figure
Integrable SU(m|n) supersymmetric electronic models of strong correlations
We generalize the SU(2|2) supersymmetric extended Hubbard model of 1/r2
interaction to the SU(m|n) supersymmetric case. Integrable models may be
defined on both uniform lattice and non-uniform one dimensional lattices. We
study both cases in detail and present the ground state wavefunctions and
energy spectra of these models.Comment: 24 pages, Late
K3 surfaces with non-symplectic automorphisms of 2-power order
This paper concerns complex algebraic K3 surfaces with an automorphism which
acts trivially on the Neron-Severi group. Complementing a result by Vorontsov
and Kondo, we determine those K3 surfaces where the order of the automorphism
is a 2-power and equals the rank of the transcendental lattice. We also study
the arithmetic of these K3 surfaces and comment on mirror symmetryComment: 19 pages, 1 figure; v3: exposition improved thanks to referee's
comment
Complementary Algorithms For Tableaux
We study four operations defined on pairs of tableaux. Algorithms for the
first three involve the familiar procedures of jeu de taquin, row insertion,
and column insertion. The fourth operation, hopscotch, is new, although
specialised versions have appeared previously. Like the other three operations,
this new operation may be computed with a set of local rules in a growth
diagram, and it preserves Knuth equivalence class. Each of these four
operations gives rise to an a priori distinct theory of dual equivalence. We
show that these four theories coincide. The four operations are linked via the
involutive tableau operations of complementation and conjugation.Comment: 29 pages, 52 .eps files for figures, JCTA, to appea
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