Effectiveness of Depolarizing noise in causing sudden death of entanglement

Abstract

Continuing on the recent observation that sudden death of entanglement can occur even when a single qubit of a two qubit state is exposed to noisy environment, we examine the local effects of several noises on bipartite qubit-qutrit and qutrit-qutrit systems. In order to rule out any initial interactions with environment, we consider maximally entangled pure states of qubit-qutrit and qutrit-qutrit systems for our analysis. We show that depolarizing and generalized amplitude damping noise can cause sudden death of entanglement in these states even when they act only on one part of the system. We also show that sudden death of entanglement occurs much faster under the action of depolarizing noise when compared to that due to generalized amplitude damping. This result strengthens the observation that depolarizing noise is more effective than other noise models in causing sudden death of entanglement.