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arXiv · 1208.6586

Entanglement Measures for Single- and Multi-Reference Correlation Effects

Katharina Boguslawski·Paweł Tecmer·Örs Legeza·Markus Reiher
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Abstract

Electron correlation effects are essential for an accurate ab initio description of molecules. A quantitative a priori knowledge of the single- or multi-reference nature of electronic structures as well as of the dominant contributions to the correlation energy can facilitate the decision regarding the optimum quantum chemical method of choice. We propose concepts from quantum information theory as orbital entanglement measures that allow us to evaluate the single- and multi-reference character of any molecular structure in a given orbital basis set. By studying these measures we can detect possible artifacts of small active spaces.

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Katharina Boguslawski, Paweł Tecmer, Örs Legeza, Markus Reiher. 2012-08-31. Entanglement Measures for Single- and Multi-Reference Correlation Effects. https://doi.org/10.1021/jz301319v

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