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Odd-even effect of quantum discord and quantum phase transitions in the S=1/2 spin ladder with ring exchange

The singularity of quantum correlations, such as quantum entanglement(QE) and quantum discord(QD), has been widely regarded as a valuable indicator for quantum phase transition(QPT) in low-dimensional quantum systems. In this paper, for a spin ladder system with ring exchange, we find that the singularity of QD (or QE) could not indicate the critical points of the system. Instead, the QD shows a novel odd-even effect in some phases, which can be used to detect the phase boundary points. The size effect is related to the symmetry breaking of the ladder.

preprint2013arXivOpen access
H. L. HuangZ. Y. SunB. Wang
quant-ph
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Open access3 authors1 topic
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H. L. HuangZ. Y. SunB. Wang

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