TITLE:
Tuning Entanglement Patterns in Qubits Clusters
AUTHORS:
F. B. M. Dos Santos, A. M. S. Macêdo
KEYWORDS:
Entanglement; Patterns; Qubits
JOURNAL NAME:
Journal of Quantum Information Science,
Vol.3 No.2,
June
14,
2013
ABSTRACT: We
identify patterns of ground state entanglement, or quantum discord, in qubit
clusters with three and four qubits, that are induced by varying the couplings
between next-nearest neighbors in the clusters. We show that these entanglement
patterns can be associated with continuous multiply connected regions in
parameter space, on which entanglement quantifiers, such as the pairwise
concurrence, exhibit a particular type of behavior as a function of the
couplings between
next-nearest neighbors in the cluster. We present the distinct patterns in
diagrams in parameter space with continuous
boundary lines and we associate each pattern to a specific type of pure quantum
correlation. We propose this procedure as a simple method to identify useful
classes of pure quantum correlations in qubit networks.