Invariant Quantum Discord in Qubit-Qutrit Systems under Local Dephasing
arXiv:1208.5705 · doi:10.1088/0031-8949/2013/T153/014036
Abstract
We investigate the dynamics of quantum discord and entanglement for a class of mixed qubit-qutrit states assuming that only the qutrit is under the action of a dephasing channel. We demonstrate that even though the entanglement in the qubit-qutrit state disappears in a finite time interval, partial coherence left in the system enables quantum discord to remain invariant throughout the whole time evolution.
6 pages, 1 figure. Submitted to the proceedings of CEWQO-2012
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