3 papers
quant-ph2005
Another dual formulation of the separability problem
D. Salgado, J. L. Sanchez-Gomez, M. Ferrero
We show how the separability problem is dual to that of decomposing any given matrix into a conic combination of rank-one partial isometries, thus offering a duality approach diffe…
quant-ph2005
On nonlinear evolution and supraluminal communication between finite quantum systems
M. Ferrero, D. Salgado, J. L. Sanchez-Gomez
We revise the 'no-signaling' condition for the supraluminal communication between two spatially separated finite quantum systems of arbitrary dimensions, thus generalizing a simila…
math-ph2004
A simple proof of the Jamiolkowski criterion for complete positivity of linear maps
D. Salgado, J. L. Sanchez-Gomez, M. Ferrero
We give a simple direct proof of the Jamiolkowski criterion to check whether a linear map between matrix algebras is completely positive or not. This proof is more accesible for ph…