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Dynamics of quantum coherence and nonlocality of a two-spin system in the chemical compass

Y. Aiache1,*, K. El Anouz1, N. Metwally2,3, and A. El Allati1,4

  • 1Laboratory of R&D in Engineering Sciences, Faculty of Sciences and Techniques Al-Hoceima, Abdelmalek Essaadi University, BP 34. Ajdir 32003, Tetouan, Morocco
  • 2Mathematics Department College of Science, University of Bahrain, Sakhir, PO Box 320038, Bahrain
  • 3Department of Mathematics, Aswan University, Aswan, Sahari 81528, Egypt
  • 4Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, D-01187 Dresden, Germany

  • *youssefaiache0@gmail.com
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Phys. Rev. E 109, 034101 – Published 1 March, 2024

DOI: https://doi.org/10.1103/PhysRevE.109.034101

Abstract

In this paper a system consisting of two electron spins has been prepared initially in a singlet state using the chemical compass model is considered. It is assumed that each electron spin interacts symmetrically and/or asymmetrically with its respective private nuclear environment in the presence of an external magnetic field. We discussed the effect of the interaction parameters and the external magnetic field on some quantifiers of quantum correlations as entanglement, coherence, Bell inequality, as well as the steerability inequality. It is shown that within a certain range of external magnetic fields, the quantum coherence and entanglement behave similarly. The Bell and the steerable inequalities predicted a similar behavior for symmetric and asymmetric interactions. Moreover, as one increases the external magnetic field, the lower bounds of both inequalities have improved. The usefulness of using the spin state as quantum channel to teleport a two-qubit system has examined where the Bell inequality could be above its classical bounds by controlling the interaction parameters. It is shown that by tuning the coupling parameters the fidelity of the teleported state exceeds the classical bounds, as well as the long-lived stationary fidelity could be achieved during the interaction time.

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Phys. Rev. E 109, 034101– Published 1 March, 2024
  • Received 9 December 2023
  • Accepted 9 February 2024
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