Correlation-coupling entropy as a measure of strong electron correlation and fragment-conditional density spin polarization as a measure of electron entanglement

R. Van Meer, O. V. Gritsenko

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Quantum entanglement has been one of the hottest topics in current day physics, since it is the driving force behind quantum cryptography, quantum teleportation, and quantum computing. Several measures of quantification of entanglement have been proposed, each of which can often only be applied to a few specific systems. In this paper we derive a kinematic measure of entanglement that is capable of giving a full description of Einstein-Podolsky-Rosen entanglement in molecular systems. The associated "coupled entropy" energy contribution generates the correct amount of strong correlation energy for the H2 and N2 prototype systems, and is shown to be able to perform the same feat if it is explicitly used as the correlation component in the density-matrix functional context. And, finally, we propose a nonkinematic way to measure the entanglement of spins by using the conditional density of the system.

Original languageEnglish
Article number032335
Pages (from-to)1-6
Number of pages6
JournalPhysical Review A
Volume100
Issue number3
DOIs
Publication statusPublished - 27 Sep 2019

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