# Robustness of 2 x N x M entangled states against qubit loss

## TL;DR

This paper investigates the robustness of 2 x N x M entangled states against qubit loss, analyzing how much quantum information remains when a qubit becomes disentangled due to environmental interactions.

## Contribution

It introduces a study on the robustness of multipartite entangled states with respect to qubit loss, focusing on the 2 x N x M state configuration.

## Key findings

- Quantifies the residual entanglement after qubit disentanglement
- Provides insights into the stability of multipartite entangled states
- Lays groundwork for understanding entanglement degradation in quantum systems

## Abstract

Entanglement in quantum systems is usually degraded by interaction with the environment. From time to time, some parties of a multipartite entangled system may become decoherent with other parties of the system due to the interference with the environment. In this situation, it is interesting to know how much information the residual system would keep on carrying. In this paper, as a starting point for any entangled system, we investigate the property of the 2 x N x M state with qubit being disentangled, which is characterized by the measurement of robustness.