Stability of global entanglement in thermal states of spin chains

Gavin K. Brennen*, Stephen S. Bullock

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


The entanglement properties of a one-dimensional chain of qubits coupled via nearest neighbor spin-spin interaction were investigated. The robustness of n-concurrences of ground states when the interaction is subject to a time-reversal antisymmetric magnetic field perturbation was studied. The n-concurrence for thermal mixed states was derived and a threshold temperature was computed below which the system has nonzero entanglement. It is observed that nearly maximal n-concurrences is achievable in the XX model with zero magnetic field for sufficiently small temperatures.

Original languageEnglish
Article number052303
Pages (from-to)052303-1-052303-12
Number of pages12
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number5
Publication statusPublished - Nov 2004
Externally publishedYes


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