Frozen discord for three qubits in a non-Markovian dephasing channel

Xi-Wen Hou

Physica A: Statistical Mechanics and its Applications, 2024, vol. 646, issue C

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.

Keywords: Quantum discord; Entanglement; Three qubits; Non-Markovian channel (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:646:y:2024:i:c:s0378437124003935

DOI: 10.1016/j.physa.2024.129884

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