Entanglement of General Two-Qubit States in a Realistic Framework

Abstract

In the present paper, we examine the quantum entanglement for more general states of two-qubit system in the context of spin coherent states (SCSs). We consider the concurrence as a quantifier of entanglement and express it in terms of SCSs. We determine new set of maximally entangled conditions that provide the maximal amount of entanglement for certain values of the amplitudes of SCSs for the case of pure states. Finally, we examine the entanglement of a class of mixed states of the two qubits and provide the range in which the entanglement value is maximal with respect to the values of the amplitudes of SCSs.

Editorial Conclusion for the Special Issue “Measurements in Quantum Mechanics”

“…We received eight submissions for this Special Issue and, after a comprehensive review process, accepted five high-quality works for publication. Among the accepted papers, Sayed Abdel-Khalek et al [1] examine quantum entanglement for more general states of two-qubit systems in the context of spin-coherent states (SCSs). They consider concurrence as a quantifier of entanglement and express it in terms of SCSs.…”