Eur. Phys. J. D 48, 435-442 (2008)
https://doi.org/10.1140/epjd/e2008-00112-5

A classification of entanglement in three-qubit systems

¹ Instituto de Matemáticas y Física Fundamental, CSIC, Serrano 113-bis, 28006 Madrid, Spain
² Departamento de Física Teórica I, Universidad Complutense de Madrid, Ciudad Universitaria, 28040 Madrid, Spain

Corresponding authors: ^a csl@imaff.cfmac.csic.es - ^b ggarciaa@fis.ucm.es

Received: 1 April 2008
Revised: 13 May 2008
Published online: 6 June 2008

Abstract

We present a classification of three-qubit states based in their three-qubit and reduced two-qubit entanglements. For pure states these criteria can be easily implemented, and the different types can be related with sets of equivalence classes under local unitary operations. For mixed states characterization of full tripartite entanglement is not yet solved in general; some partial results will be presented here.