16.09 PPT-inducing, distillation-prohibiting, and entanglement-binding quantum channels
The new paper is avalable at arXiv:1409.4036 [quant-ph]
Entanglement degradation in open quantum systems is reviewed in the Choi-Jamiolkowski representation of linear maps. In addition to physical processes of entanglement dissociation and entanglement annihilation, we consider quantum dynamics transforming arbitrary input states into those that remain positive under partial transpose (PPT-inducing channels). Such evolutions form a convex subset of distillation-prohibiting channels. A relation between the above channels and entanglement-binding ones is clarified. An example of the distillation-prohibiting map Ф(х)Ф is given, where Ф is not entanglement binding.
20.07 RIA Novosti, Vesti 24, and MIPT press releases
RIA Novosti: Russian physicist invented a way to safely transmit quantum signals [in Russian]
Vesti 24: Teleportation may become real [in Russian]
03.07 PRA Rapid Communication and Editors' Suggestion
Our recent paper "Entanglement sensitivity to signal attenuation and amplification" has just been published in Physical Review A and selected as an Editors' Suggestion: http://journals.aps.org/pra/highlights
The text is available at the journal website and ArXiv
The paper's idea is briefly outlined here
10.06 CEQIP workshop 2014
11th Central European Quantum Information Processing Workshop was held in Znojmo, Czech Republic during the period of June 5-8, 2014. My talk "Dissociation and annihilation of multi-partite entanglement structures" was based on recent papers with Mario Ziman.
09.05 Entanglement sensitivity to signal attenuation and amplification
Recent paper written in collaboration with Mario Ziman is now available at arXiv:1405.1754 [quant-ph]
In this paper, we analyze general laws of continuous-variable entanglement dynamics during the deterministic attenuation and amplification of the physical signal carrying the entanglement. These processes are inevitably accompanied by noises, so we find fundamental limitations on noise intensities that destroy entanglement of gaussian and non-gaussian input states.