Quantum discord in finite XY chains

Details Quantum discord in finite XY chains Quantum discord in finite XY chains

2011-04-29

arxiv.org/abs/1105.0027v1

Physical Review A 82, 042316 (2010)

Physics

Quantum Physics

9 pages, 6 figures

Scientific paper

We examine the quantum discord between two spins in the exact ground state of finite spin 1/2 arrays with anisotropic XY couplings in a transverse field B. It is shown that in the vicinity of the factorizing field B_s, the discord approaches a common finite non-negligible limit which is independent of the pair separation and the coupling range. An analytic expression of this limit is provided. The discord of a mixture of aligned pairs in two different directions, crucial for the previous results, is analyzed in detail, including the evaluation of coherence effects, relevant in small samples and responsible for a parity splitting at B_s. Exact results for finite chains with first neighbor and full range couplings and their interpretation in terms of such mixtures are provided.

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