We investigated numerically the dynamics of quantum Fisher information (QFI) and entanglement for three-and four-level atomic systems interacting with a coherent field under the effect of Stark shift and Kerr medium. It was observed that the Stark shift and Kerr-like medium play a prominent role during the time evolution of the quantum systems. The non-linear Kerr medium has a stronger effect on the dynamics of QFI as compared to the quantum entanglement (QE). QFI is heavily suppressed by increasing the value of Kerr parameter. This behavior was found comparable in the cases of three-and four-level atomic systems coupled with a non-linear Kerr medium. However, QFI and quantum entanglement (QE) maintain their periodic nature under atomic motion. On the other hand, the local maximum value of QFI and von Neumann entropy (VNE) decrease gradually under the Stark effect. Moreover, no prominent difference in the behavior of QFI and QE was observed for three-and four-level atoms while increasing the value of Stark parameter. However, three-and four-level atomic systems were found equally prone to the non-linear Kerr medium and Stark effect. Furthermore, three-and four-level atomic systems were found fully prone to the Kerr-like medium and Stark effect. and quantum information theory. Quantum entanglement (QE) was first studied by Schrodinge [9,10] as a basic phenomenon of quantum mechanics and it has no similarity with classical approach [11]. On the other hand, quantum correlations are used to calculate the quantum states of complex systems. The correlations of complex systems do not depend on the spatial separation of components, so the system behaves as a single system. Schrodinger explained that the information of different parts of the system would not contain the complete information of the whole system [11]. Thus, quantum correlations are the result of the quantum measurements that explain the solution and information of different physical systems such as Bell inequalities [12,13] and confirm the experimental segment of the spooky action at a distance. During the last few years, due to the extensive progress in the field of quantum information processing (QIP), the new field of quantum metrology has become important and prominent [14,15]. The importance of QE in a different process has led to the investigation of larger dimensional quantum systems and has shown an important and significant role in quantum systems of many particles [16]. Since the quantum systems are not completely closed, the dynamical response is observed when the system loses coherence due to interaction with the environment. During the interaction of a quantum system with the environment, the dynamics of the system behave as an open system. Hence, the study of the dynamics of different physical quantities, during the interaction between complex quantum systems and the environment, becomes very attractive and interesting. This interaction causes a quantum noise that creates fluctuations such as decoherence and dissipative dynamics that are not r...
We have investigated numerically the dynamics of quantum Fisher information (QFI) and quantum entanglement (QE) for N-level atomic system interacting with a coherent field in the presence of Kerr (linear and non-linear medium) and Stark effects. It is observed that the Stark and Kerr effects play a prominent role during the time evolution of the quantum system. The evolving quantum Fisher information (QFI) is noted as time grows under the non-linear Kerr medium contrary to the QE for higher dimensional systems. The effect of non-linear Kerr medium is greater on the QE as we increase the value of Kerr parameter. However, QFI and QE maintain their periodic nature under atomic motion. On the other hand, linear Kerr medium has no prominent effects on the dynamics of N-level atomic system. Furthermore, it has been observed that QFI and QE decay soon under the influence of Stark effect. In short, the N-level atomic system is found prone to the change of the Kerr medium and Stark effect for higher dimensional systems.
Dynamical evolution of global quantum discord (GQD) and von Neumann entropy (VNE) is studied for N two-level atomic system (TLS) (two, three and four TLS). The system interacts with the single mode Fock field and the cavity is filled with the non-linear Kerr medium (NLKM). It is seen that for large values of the Kerr parameter, the GQD and VNE show periodic behavior which leads to the sudden death and birth of the quantum entanglement (QE). It is found that the oscillations of the GQD is suppressed for the initial mixed state. The VNE has non-zero values of quantum interference throughout the dynamics of the system for initial mixed states. It is also found that the multipartite systems show sustained response to the QE during the time evolution. Moreover, the GQD and VNE are notably affected in the presence of the NLKM and affected for the entire range of Kerr values as we increase the number of photons in the cavity. Furthermore, for both initial pure and mixed states, the periodic behavior of the GQD and VNE is almost the same for the case of moving TLS. The sudden death and birth of QE is more prominent for moving TLS case. The atomic motion is favorable to sustain the QE in the atomic systems in a NLKM.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.