60 citations · 364 across the 22 of their papers we have counts for
9 papers · 2 filters
Separability of qubit-qudit quantum states with strong positive partial transposes
Kil-Chan Ha
We show that all states with strong positive partial transposes (SPPT) are separable. We also construct a family of entangled SPPT states, so the conjectu…
Exposedness of Choi type entanglement witnesses and applications to lengths of separable states
Kil-Chan Ha, Seung-Hyeok Kye
We present a large class of indecomposable exposed positive linear maps between three dimensional matrix algebras. We also construct two qutrit separable states with lengths ten in…
Separable states with unique decompositions
Kil-Chan Ha, Seung-Hyeok Kye
We search for faces of the convex set consisting of all separable states, which are affinely isomorphic to simplices, to get separable states with unique decompositions. In the two…
Optimal indecomposable witnesses without extremality as well as spanning property
Kil-Chan Ha, Hoseog Yu
One of the interesting problems on optimal indecomposable entanglement witnesses is whether there exists an optimal indecomposable witness which neither has the spanning property n…
Entanglement witnesses arising from Choi type positive linear maps
Kil-Chan Ha, Seung-Hyeok Kye
We construct optimal PPTES witnesses to detect PPT entangled edge states of type constructed recently \cite{kye_osaka}. To do this, we consider positive linear…
Optimal PPTES witnesses for states in
Kil-Chan Ha
Recently, X. Qi and J. Hou [Phys. Rev. A 85, 022334 (2012)] provided optimal entanglement witnesses without the spanning property. These witnesses are associated to indecomposable…