Multipartite entanglement dynamics in a cavity. (13th May 2015)

• Record Type: Journal Article
• Authors: Amaro, J G; Pineda, C
• Is Part Of: Physica scripta. Volume 90:Number 6(2015:Jun.)
• Publication Date: 2015-05-13
• Subjects: decoherence -- entanglement -- multipartite; 03.65.Yz -- 03.67.-a; Physics -- Periodicals; 530.05
• DOI: 10.1088/0031-8949/90/6/068019
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: We study the dynamics of two kinds of entanglement and their interplay. On one hand, we consider the intrinsic entanglement within a central system composed of three two-level atoms and measured by multipartite concurrence; on the other, we consider the entanglement between the central system and a cavity, acting as an environment and measured with purity. Using dipole-dipole and Ising interactions between atoms, we propose two Hamiltonians: one homogeneous and one quasi-homogeneous. We find an upper bound for concurrence as a function of purity, associated with the evolution of the W state. A lower bound is also observed for the homogeneous case. In both situations, we show the existence of critical values of the interaction, for which the dynamics of entanglement seem complex.