23 citations · 33 across the 6 of their papers we have counts for
Showing 2006Show all
3 papers · 1 filter
quant-ph2006★ 4 cited
Concurrence of Lorentz-positive maps
Roland Hildebrand
Let L_n be the n-dimensional Lorentz cone. A linear map M from R^m to R^n is called Lorentz-positive if M[L_m] is contained in L_n. We extend the notion of concurrence, which was i…
cs.CC2006
Combinatorial laplacians and positivity under partial transpose
Roland Hildebrand, Stefano Mancini, Simone Severini
Density matrices of graphs are combinatorial laplacians normalized to have trace one (Braunstein \emph{et al.} \emph{Phys. Rev. A,} \textbf{73}:1, 012320 (2006)). If the vertices o…
quant-ph2006★ 2 cited
Separable balls around the maximally mixed state for a 3-qubit system
Roland Hildebrand
We obtain a new lower bound on the radius of the largest ball of separable unnormalized states around the identity matrix for a 3-qubit system. This also enables us to improve the…