67 citations · 97 across the 2 of their papers we have counts for
2 papers
math.CO2004★ 67 cited
Birkhoff's polytope and unistochastic matrices, N=3 and N=4
Ingemar Bengtsson, Asa Ericsson, Marek Kus +2
The set of bistochastic or doubly stochastic N by N matrices form a convex set called Birkhoff's polytope, that we describe in some detail. Our problem is to characterize the set o…
quant-ph2003★ 30 cited
Entanglement of 2xK quantum systems
Artur Lozinski, Andreas Buchleitner, Karol Zyczkowski +1
We derive an analytical expression for the lower bound of the concurrence of mixed quantum states of composite 2xK systems. In contrast to other, implicitly defined entanglement me…