Some studies of the interaction between two two-level atoms and SU (1, 1) quantum systems

Abstract

Herein, we present an approach to look for the best phenomenon to measure quantum correlation. The system of two isolated qubits each interacting with a single-mode cavity was theoretically created to study the quantum correlation. Some of the phenomena, such as the quantum discord and concurrence, were generated through such a system. The influences of initial state purity, qubit motion, and detuning parameters were discussed for the phenomena. These parameters for a specific value show that the behavior of phenomena are analogous. It is interesting to mention that some values of detuning undergo a sudden death of phenomena, and the quantum discord still captures the qubits quantum correlation. We predict that the quantum discord may be a better measure of quantum correlation than concurrence.

Quantum coherence and correlation dynamics of two-qubit system in spin bath environment*

“…The relationship between quantum discord and entanglement has been extensively studied in various systems in the past. [34][35][36] The feature that quantum discord is more robust than entanglement is also widely found. Because the entanglement measure only reflects a part of the nature of quantum correlation, and the discord more reflects the global characteristics of quantum correlation.…”

A nonlinear interaction between SU(1,1) quantum system and a three-level atom in different configurations with damping term

“…The properties of the SU(1,1) interaction with SU(2) in presence of cavity damping depending on SU(1,1)-cavity damping has been studied [21][22][23]. Quantum correlation has been studied for a system consisting of two isolated bits, each interacting with a single-mode cavity in [24]. Also, the dynamical behaviour of SU(1,1) interacting with SU(2) algebraic system has been derived in [25].…”