https://doi.org/10.1140/epjp/s13360-020-00423-7
Regular Article
Quantum correlations and quantum Fisher information of two qubits in the presence of the time-dependent coupling effect
1
Department of Physics, Faculty of Science, King Abdulaziz University, 21438, Jeddah, Saudi Arabia
2
Mathematics Department, Faculty of Science, Sohag University, 82524, Sohag, Egypt
3
Mathematics Department, Faculty of Science, Taif Univesity, 21974, Taif, Saudi Arabia
4
Department of Physics, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia
5
Kulliyyah of ICT, International Islamic University (IIUM), Kuala Lumpur, Malaysia
6
Cybersecurity & Systems Unit, Islamic Science Institute, USIM, 71800 Nilai, Negeri Sembilan, Malaysia
Received:
29
November
2019
Accepted:
28
April
2020
Published online:
4
June
2020
In this paper, we consider two separate Jaynes–Cummings (JC) nodes with a nonidentical qubit-field system in the presence of dissipation terms. We reveal the influence of the time variation of the coupling terms on some important measures when the qubits are immersed in a vacuum. The density matrix for the two qubits initially in Bell states are obtained. The dynamical behavior of the quantum discord (QD), classical correlation (CC), qubit-qubit entanglement, and quantum Fisher information (QFI) is investigated. We explore the relationship among QD, CC, qubit-qubit entanglement, and QFI in the absence and presence of the dissipation effect during the time evolution. Furthermore, we show the main optimal conditions for obtaining a high level of correlation and coherence between the two qubits.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020
