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01.01.2021

Tripartite quantum discord dynamics in qubits driven by the joint influence of distinct classical noises

verfasst von: Kuate Fodouop Fabrice, Tsamouo Tsokeng Arthur, Nguenang Nganyo Pernel, Tchoffo Martin, Lukong Cornelius Fai

Erschienen in: Quantum Information Processing | Ausgabe 1/2021

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Abstract

We investigate the dynamics of quantum discord in a system of three non-interacting qubits, initially entangled in a Greenberger–Horne–Zeilinger state, in the presence of mixed classical environments. Precisely, the joint impacts of a static noise (SN) and a random telegraphic noise (RTN) are probed, by combining them in two different ways: independent and bipartite system–environment coupling. For both cases, one marginal system is coupled with an environment (say \(E_1\)), and the remaining subsystems are coupled either locally or not with a second environment (\(E_2\)), and vice versa. We show that quantum discord is more fragile in independent environments than in bipartite ones no matter the Markovianity of the dynamical process, and may exhibit sudden death and revival phenomena. A static noise is more fatal to the survival of quantum discord than a RTN, and its shielding effects are more pronounced as the number of subsystems under its effects increases. The opposite is found for a RTN, where discord robustness is enhanced as the number of affected subsystems increases.

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Titel: Tripartite quantum discord dynamics in qubits driven by the joint influence of distinct classical noises
verfasst von: Kuate Fodouop Fabrice
Tsamouo Tsokeng Arthur
Nguenang Nganyo Pernel
Tchoffo Martin
Lukong Cornelius Fai
Publikationsdatum: 01.01.2021
Verlag: Springer US
Erschienen in: Quantum Information Processing / Ausgabe 1/2021
Print ISSN: 1570-0755
Elektronische ISSN: 1573-1332
DOI: https://doi.org/10.1007/s11128-020-02967-0

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