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Three-spin interactions in optical lattices and criticality in cluster Hamiltonians | | Jiannis K. Pachos
; Martin B. Plenio
; | | Date: |
19 Dec 2003 | | Journal: | Phys. Rev. Lett. 93, 056402 (2004) | | Subject: | Quantum Physics; Soft Condensed Matter | quant-ph cond-mat.soft | | Affiliation: | DAMTP) and Martin B. Plenio (ICL | | Abstract: | We demonstrate that in a triangular configuration of an optical lattice of two atomic species a variety of novel spin-1/2 Hamiltonians can be generated. They include effective three-spin interactions resulting from the possibility of atoms tunneling along two different paths. This motivates the study of ground state properties of various three-spin Hamiltonians in terms of their two-point and n-point correlations as well as the localizable entanglement. We present a Hamiltonian with a finite energy gap above its unique ground state for which the localizable entanglement length diverges for a wide interval of applied external fields, while at the same time the classical correlation length remains finite. | | Source: | arXiv, quant-ph/0401106 | | Other source: | [GID 731176] pmid15323718 | | Services: | Forum | Review | PDF | Favorites | |
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