INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Entanglement of finite spin chains at transverse factorizing field
R. ROSSIGNOLI; N. CANOSA; J.M. MATERA
Workshop; II QUANTUM INFORMATION SCHOOL AND WORKSHOP.; 2009
CNPq - Institute for Quantum Computing
We examine the entanglement of finite spin chains with anisotropic XYZ couplings of arbitrary range at transverse factorizing fields, where the system exhibits a degenerate parity-breaking separable ground state (GS). It is shown, however, that the side limits of the ground state pairwise entanglement at these fields are actually non-zero in finite chains, corresponding such fields to a GS spin-parity transition. These limits exhibit universal properties like being independent of the interaction range and pair separation, and are directly related to the magnetization step. Illustrative exact results for chains with full range and nearest neighbor couplings will be shown. Other entanglement properties at such points will also be discussed.