Chinese Physics Letters

Distillability Sudden Birth of Entanglement for Qutrit-Qutrit Systems

Jiang Huang, Mazhar Ali

Published Nov 1, 2014• 7 citations

Abstract

We report the sudden appearance of distillability between two statistically independent reservoirs modelled as qutrit-qutrit systems. This feature of bipartite quantum systems is different from the previously observed phenomenon of entanglement sudden birth. It is found that the states of reservoirs first become bound entangled, thus exhibiting entanglement sudden birth, consequently followed by the sudden birth of distillability, and it is shown that whenever distillability is lost abruptly from principal system, it also necessarily appears abruptly among reservoirs' degrees of freedom. This surprising observation reflects yet another peculiarity of dynamical aspects of quantum entanglement.

DOI: 10.1088/0256-307x/31/11/110301

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Comments on “Distillability sudden death in qutrit—qutrit systems under thermal reservoirs”

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In a recent paper ( 2012 Chin. Phys. B 21 084205 ), the authors studied the problem of distillability sudden death. We find that their equation of motion is incorrect and consequently the rest of the paper is wrong. Even apart from starting with a wrong equation of motion, their description of the phenomenon of distillability sudden death is totally misleading and needs to be rectified. To this aim, we show that certain initially prepared free-entangled states become bound-entangled in a finite time under thermal reservoirs. Moreover, in contrast with zero-temperature reservoirs, simple local unitary transformations cannot completely avoid distillability sudden death.

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