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We investigate the dynamics of quantum discord and entanglement for a classof mixed qubit-qutrit states assuming that only the qutrit is under the actionof a dephasing channel. We demonstrate that even though the entanglement in thequbit-qutrit state disappears in a finite time interval, partial coherence leftin the system enables quantum discord to remain invariant throughout the wholetime evolution.

Invariant Quantum Discord in Qubit-Qutrit Systems under Local Dephasing