5 papers
Towards parameterizing the entanglement body of a qubit pair
Arsen Khvedelidze, Dimitar Mladenov, Astghik Torosyan
A method allowing to increase a computational efficiency of evaluation of non-local characteristics of a pair of qubits is described. The method is based on the construction of coo…
One other parameterization of SU(4) group
Arsen Khvedelidze, Dimitar Mladenov, Astghik Torosyan
We propose a special decomposition of the Lie algebra into the direct sum of orthogonal subspaces, $\mathfrak{su}(4)=\mathfrak{k}\oplus\mathfrak{a}\oplus\mathfra…
On the nonclassicality distance indicator of qudits
Arsen Khvedelidze, Astghik Torosyan
We consider the nonclassicality distance indicator of a state in finite-dimensional quantum systems which is evaluating a state nonclassicality by its remoteness from the set of "c…
Comparing classicality of qutrits from Hilbert-Schmidt, Bures and Bogoliubov-Kubo-Mori ensembles
Arsen Khvedelidze, Astghik Torosyan
In the report we analyze the indicator/measure of classicality of quantum states defined as the probability to find a state with a positive Wigner function within a unitary invaria…
Spectrum and separability of mixed 2-qubit X-states
Arsen Khvedelidze, Astghik Torosyan
The separable mixed 2-qubit X-states are classified in accordance with degeneracies in the spectrum of density matrices. It is shown that there are four classes of separable X-stat…