Quantum correlations and quantum fisher information of two qubits in the presence of the time-dependent coupling effect

• Main Authors: Raffah,, Bahaaudin Mohammadnoor, Abdel-khalek,, Sayed, Berrada,, Kamal, Khalil,, Eied, Al-Hadeethi,, Yas Fadel, Almalky,, Nawal, Wahiddin, Mohamed Ridza
• Format: Article
• Language: English; English; English
• Published: Springer 2020
• Subjects: T Technology (General)
• Online Access: http://irep.iium.edu.my/81530/1/81530_Quantum%20correlations%20and%20quantum_MYRA.pdf; http://irep.iium.edu.my/81530/2/81530_Quantum%20correlations%20and%20quantum_SCOPUS.pdf; http://irep.iium.edu.my/81530/3/81530_Quantum%20correlations%20and%20quantum_WOS.pdf; http://irep.iium.edu.my/81530/; https://link-springer-com.ezproxy.um.edu.my/article/10.1140%2Fepjp%2Fs13360-020-00423-7

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. © 2020, Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.