# Entanglement-breaking of quantum dynamical channels

## TL;DR

This paper investigates the conditions under which quantum channels break entanglement in qubit systems, introduces the concept of strong entanglement-breaking channels, and explores how these channels can be amended.

## Contribution

It provides necessary and sufficient conditions for entanglement-breaking in quantum channels and introduces the novel concept of strong entanglement-breaking channels.

## Key findings

- Characterization of entanglement-breaking channels for qubits
- Introduction of strong entanglement-breaking channels
- Analysis of how to amend entanglement-breaking channels

## Abstract

Entanglement is a key issue in the quantum physics which gives rise to resources for achieving tasks that are not possible within the realm of classical physics. Quantum entanglement varies with the evolution of the quantum systems. It is of significance to investigate the entanglement dynamics in terms of quantum channels. We study the entanglement-breaking channels and present the necessary and sufficient conditions for a quantum channel to an entanglement-breaking one for qubit systems. Furthermore, a concept of strong entanglement-breaking channel is introduced. The amendment of entanglement-breaking channels is also studied.