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6 papers · 2 filters
Nonlocal correlations for manifold quantum systems: Entanglement of two-spin states
K. Berrada, A. Mohammadzade, S. Abdel-Khalek +2
In this paper, we study the bipartite entanglement of spin coherent states in the case of pure and mixed states. By a proper choice of the subsystem spins, the entanglement for lar…
Quantum discord for multipartite coherent states interpolating between Werner and Greenberger-Horne-Zeilinger states
M. Daoud, R. Ahl Laamara
The quantum discord is used as measure of quantum correlations for two families of multipartite coherent states. The first family interpolates between generalized GHZ states and ge…
Geometric Measure of Pairwise Quantum Discord for Superpositions of Multipartite Generalized Coherent States
M. Daoud, R. Ahl Laamara
We give the explicit expressions of the pairwise quantum correlations present in superpositions of multipartite coherent states. A special attention is devoted to the evaluation of…
Quantum discord of Bell cat-states under amplitude damping
M. Daoud, R. Ahl Laamara
The evolution of pairwise quantum correlations of Bell cat-states under amplitude damping is examined using the concept of quantum discord which goes beyond entanglement. A closed…
Three dimensional quantum key distribution in the presence of several eavesdroppers
M. Daoud, H. Ez-zahraouy
Quantum key distribution based on encoding in three dimensional systems in the presence of several eavesdroppers is proposed. This extends the BB84 protocol in the presence of many…
Quantum correlations between each qubit in a two-atom system and the environment in terms of interatomic distance
K. Berrada, F. F. Fanchini, S. Abdel-Khalek
The quantum correlations between a qubit and its environment are described quantitatively in terms of interatomic distance. Specifically, considering a realistic system of two two-…