Pairwise concurrence dynamics: A four-qubit model

M. Yönaç, Ting Yu, J. H. Eberly

Research output: Contribution to journalArticlepeer-review

187 Scopus citations

Abstract

We examine entanglement dynamics via concurrence among four two-state systems labelled A, a, B, b. The four systems are arranged on an addressable 'lattice' in such a way that A and a at one location labelled Aa can interact with each other via excitation exchange, and the same for B and b at location Bb. The Aa location is prepared entangled with the Bb location, but their mutual complete isolation prevents interaction in the interval between actions of an external addressing agent. There are six pairwise concurrences on the lattice, and we follow their evolution in the interval between external actions. We show how entanglement evolves and may exhibit the non-analytic effect termed entanglement sudden death (ESD), with periodic recovery. These loss and gain processes may be interpreted as entanglement transfers between the subsystems.

Original languageEnglish
Article numberS02
Pages (from-to)S45-S59
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume40
Issue number9
DOIs
StatePublished - 14 May 2007

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