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International Journal of Theoretical Physics

The Intrinsic Decoherence Effects on Nonclassical Correlations in a Dipole-Dipole Two-Spin System with Dzyaloshinsky-Moriya Interaction

Mansoura Oumennana, Essalha Chaouki, Mostafa Mansour

Published Dec 29, 2022• 13 citations
Publisher
DOI
10.1007/s10773-022-05255-y

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Abstract This research delves into the dynamic evolution of bipartite entanglement and nonclassical correlations within a two-spin system governed by dipole-dipole interactions and Dzyaloshinsky-Moriya (DM) coupling, while affected by intrinsic decoherence (ID). Beginning with the initialization of the bipartite system in a Werner state, we investigate how ID, dipolar coupling parameters, DM interaction strength, and uniform magnetic field strengths influence the progression of quantum entanglement and nonclassical correlations. Logarithmic negativity serves as a metric for quantifying entanglement, while quantum discord is employed to probe nonclassical correlations beyond entanglement. Our results highlight that strategic adjustments to the system parameters can alleviate the undesirable impact of ID. Moreover, the choice of initial state and its degree of pureness significantly influences the levels of entanglement and quantum discord within the dipolar-coupled spins system.
Various thermal correlations as well as the effect of intrinsic decoherence on the correlations are studied in a two-qubit Heisenberg XYZ spin chain with the Dzyaloshinski—Moriya (DM) interaction along the z direction, i.e. D z . It is found that tunable parameter D z may play a constructive role on the concurrence C, classical correlation (CC) and quantum discord (QD) in thermal equilibrium while it plays a destructive role on the correlations in the intrinsic decoherence case. The entanglement and quantum discord exhibit collapse and revival under the phase decoherence. With a proper combination of the system parameters, the correlations can effectively be kept at high steady state values despite the intrinsic decoherence.