Highly Entangled Ground States in Tripartite Qubit Systems
Quantum Physics
2008-03-19 v2 Mesoscale and Nanoscale Physics
Abstract
We investigate the creation of highly entangled ground states in a system of three exchange-coupled qubits arranged in a ring geometry. Suitable magnetic field configurations yielding approximate GHZ and exact W ground states are identified. The entanglement in the system is studied at finite temperature in terms of the mixed-state tangle tau. By adapting a steepest-descent optimization algorithm we demonstrate that tau can be evaluated efficiently and with high precision. We identify the parameter regime for which the equilibrium entanglement of the tripartite system reaches its maximum.
Cite
@article{arxiv.0705.1710,
title = {Highly Entangled Ground States in Tripartite Qubit Systems},
author = {Beat Röthlisberger and Jörg Lehmann and D. S. Saraga and Philipp Traber and Daniel Loss},
journal= {arXiv preprint arXiv:0705.1710},
year = {2008}
}