Armin Uhlmann
Published 2006-05-11Version 1
Concurrence and further entanglement quantifyers can be computed explicitly for channels of rank two if representable by just two Kraus operators. Almost all details are available for the subclass of rank two 1-qubit-channels. There is a simple geometric picture beyond, explaining nicely the role of anti-linearity.
Comments: 20 pages. An appendix is added. An error in (45) - (47) and known (to me) misspellings are corrected
Journal: Open Sys. & Information Dynamics 12 (2005) 1 - 14
Concurrence and negativity as distances
Lower Bound of Concurrence for Qubit Systems
Concurrence of Stochastic 1-Qubit Maps
