Abstract
The analytic form of quantum discord by Radhakrishnan et al. (2020) is derived for three qubits under a non-Markovian dephasing channel, where tripartite entanglement is explicitly calculated for reference. The necessary and sufficient conditions for the frozen discord are presented. It is shown that tripartite discord can exhibit multiple intervals of freezing under such conditions, while the entanglement displays multiply sudden deaths and revivals.
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