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Quantum correlation dynamics of a three-qubit system coupled to an XY spin chain

  • Jin-Liang GuoEmail author
  • Gui-Lu Long
Regular Article

Abstract

We study the dynamics of multipartite quantum correlations measured by the lower bound of concurrence and quantum discord in a three-qubit system coupled to an XY spin chain. For the initial pure GHZ and W state, we find the lower bound of entanglement is more robust than the quantum discord against the decoherence induced by the spin environment. But for the Werner state, the sudden death of discord is not observed even in the presence of entanglement sudden death. By comparing the evolutions for the GHZ and W states, we show that the W state preserves more quantum correlations than the GHZ state. In addition, we put research emphasis on the relation between the dynamics of multipartite quantum correlations and the quantum phase transition of the spin environment.

Keywords

Quantum Information 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.College of Physics and Electronic Information ScienceTianjin Normal UniversityTianjinP.R. China
  2. 2.State Key Laboratory of Low-dimensional Quantum Physics and Department of PhysicsTsinghua UniversityBeijingP.R. China
  3. 3.Tsinghua National Laboratory for Information Science and TechnologyTsinghua UniversityBeijingP.R. China

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