23 citations · 33 across the 6 of their papers we have counts for
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quant-ph2007★ 23 cited
Entangled states close to the maximally mixed state
Roland Hildebrand
We give improved upper bounds on the radius of the largest ball of separable states of an m-qubit system around the maximally mixed state. The ratio between the upper bound and the…
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…
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…