Thermal robustness of multipartite entanglement of the 1-D spin 1/2 XY model

Abstract

We study the robustness of multipartite entanglement of the ground state of the one-dimensional spin 1/2 XY model with a transverse magnetic field in the presence of thermal excitations, by investigating a threshold temperature, below which the thermal state is guaranteed to be entangled. We obtain the threshold temperature based on the geometric measure of entanglement of the ground state. The threshold temperature reflects three characteristic lines in the phase diagram of the correlation function. Our approach reveals a region where multipartite entanglement at zero temperature is high but is thermally fragile, and another region where multipartite entanglement at zero temperature is low but is thermally robust.

arXiv commentRevised, 11 pages, 7 figures

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Cited by in corpus (14)

• Entanglement detection
• Genuine quantum correlations in quantum many-body systems: a review of recent progress
• The geometric measure of entanglement for symmetric states
• Multiqubit symmetric states with high geometric entanglement
• Multipartite Entanglement at Finite Temperature
• The geometric measure of entanglement for a symmetric pure state with positive amplitudes
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• Entanglement marginal problems
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• Role of external fields in enhancing long-distance entanglement at finite temperatures
• Multipartite entanglement in quantum phase transitions