Quantum correlation in three-qubit Heisenberg model with Dzyaloshinskii-Moriya interaction
arXiv:1104.1525 · doi:10.1088/0253-6102/58/1/08
Abstract
We investigate the pairwise thermal quantum discord in a three-qubit XXZ model with Dzyaloshinskii-Moriya (DM) interaction. We find that the DM interaction can increase quantum discord to a fixed value in the anti- ferromagnetic system, but decreases quantum discord to a minimum first, then increases it to a fixed value in the ferromagnetic system. Abrupt change of quantum discord is observed, which indicates the abrupt change of groundstate. Dynamics of pairwise thermal quantum discord is also considered. We show that thermal discord vanishes in asymptotic limit regardless of its initial values, while thermal entanglement suddenly disappears at finite time.
6 pages, 6 figures
References in corpus (11)
- Quantum discord and the power of one qubit
- Experimental quantum computing without entanglement
- Robustness of quantum discord to sudden death
- Classical and quantum correlations under decoherence
- Quantum discord and quantum phase transition in spin chains
- Quantum and classical correlations in the one-dimensional XY model with Dzyaloshinskii-Moriya interaction
- Quantum discord in finite XY chains
- Spotlighting quantum critical points via quantum correlations at finite temperatures
- Enhancement of entanglement transfer in a spin chain by phase shift-control
- Entanglement dynamics of three-qubit states in noisy channels
- Quantum Discord in the Ground and Thermal States of Spin Clusters