62 citations · 146 across the 13 of their papers we have counts for
5 papers · 1 filter
On Kossakowski construction of positive maps in matrix algebras
Dariusz Chruściński
We provide a further analysis of the class of positive maps proposed ten years ago by Kossakowski. In particular we propose a new parametrization which reveals an elegant geometric…
Entanglement witnesses for systems and new classes of entangled qudit states
D. Chruściński, A. Rutkowski
We provide a new class of entanglement witnesses for $d \ot d$ systems (two qudits). Our construction generalizes the one proposed recently by Jafarizadeh et al. for and $d=4…
Local numerical range for a class of hermitian operators
J. Jurkowski, A. Rutkowski, D. Chruściński
A local numerical range is analyzed for a family of circulant observables and states of composite systems. It is shown that for any circulant operator $\…
Decoherence-free subspaces for a quantum register interacting with a spin environment
Paweł Należyty, Dariusz Chruściński
We study a model of a quantum spin register interacting with an environment of spin particles in quantum-measurement limit. In the limit of collective decoherence we obtain the for…
A class of symmetric Bell diagonal entanglement witnesses - a geometric perspective
Dariusz Chruściński
We provide a class of Bell diagonal entanglement witnesses displaying an additional local symmetry -- a maximal commutative subgroup of the unitary group U(n). Remarkably, this cla…