Entanglement dynamics of two-qubit system in different types of noisy channels

TL;DR

This paper investigates how different noisy quantum channels affect the entanglement of two-qubit states, highlighting the role of initial purity in entanglement robustness and phenomena like entanglement sudden death.

Contribution

It provides a comparative analysis of entanglement dynamics under amplitude damping, phase damping, and depolarizing channels, emphasizing the impact of initial state purity.

Findings

Purity influences entanglement robustness in noisy channels.

Mixed initial states can lead to entanglement sudden death.

Critical probabilities for entanglement disappearance vary with initial purity.

Abstract

In this paper, we study entanglement dynamics of a two-qubit extended Werner-like state locally interacting with independent noisy channels, i.e., amplitude damping, phase damping and depolarizing channels. We show that the purity of initial entangled state has direct impacts on the entanglement robustness in each noisy channel. That is, if the initial entangled state is prepared in mixed instead of pure form, the state may exhibit entanglement sudden death (ESD) and/or be decreased for the critical probability at which the entanglement disappear.