Quantum Discord Surge Heralds Entanglement Revival in an Infinite Spin Chain

Details Quantum Discord Surge Heralds Entanglement Revival in an Infinite Spin Chain Quantum Discord Surge Heralds Entanglement Revival in an Infinite Spin Chain

2010-11-24

arxiv.org/abs/1011.5309v1

Physics

Quantum Physics

8 pages, 6 figures, RevTeX4

Scientific paper

Measures of quantum correlation defined from an information-theoretic perspective, viz., quantum discord and quantum work-deficit, are applied to study the time-evolution of the infinite anisotropic quantum XY spin chain, in a transverse time-dependent field. We show that both the measures can be associated with the collapse and revival of nearest-neighbor entanglement in a dynamical phase transition present in the time-evolution of the system. In particular, we find that revival of entanglement of the evolved state happens if there is an increase in quantum discord in the vicinity of entanglement collapse.

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