Topological disentangler for the valence-bond-solid chain

Details Topological disentangler for the valence-bond-solid chain Topological disentangler for the valence-bond-solid chain

2010-11-15

arxiv.org/abs/1011.3277v1

Phys. Rev. B 83, 104411 (2011)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.83.104411

We discuss topological disentangler for S=1 quantum spin chains in the Haldane phase. We first point out that Kennedy-Tasaki's(KT) nonlocal unitary transformation is the perfect disentangler for Affleck-Kennedy-Lieb-Tasaki model. We then demonstrate that the KT transformation can be reconstructed as an assembly of pair disentanglers. Finally, we show that the KT transformation can be regarded as a topological disentangler, which selectively disentangles the double-fold degeneracy in the entanglement spectrum of the S=1 Heisenberg chain.

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