# Delayed sudden death of entanglement at exceptional points

## TL;DR

This paper explores how exceptional points in non-Hermitian systems can delay the sudden death of entanglement, potentially improving quantum information protocols.

## Contribution

It introduces a scheme using exceptional points in PT-symmetric optomechanical systems to delay entanglement sudden death, extending to higher-order exceptional points.

## Key findings

- Delay in entanglement sudden death near exceptional points
- Extension of delay effect to third-order exceptional points
- Potential for improved quantum information processing

## Abstract

Almost a decade ago, physicists encountered a strange quantum phenomenon that predicts an unusual death of entanglement under the influence of local noisy environment,known as entanglement sudden death (ESD). This could be an immediate stumbling block in realizing all the entanglement based quantum information and computation protocols. In this work, we propose a scheme to tackle such shortcomings by exploiting the phenomenon of exceptional points (EP). Starting with a binary mechanical $\mathcal{PT}$ symmetric system, realized over an optomechanical platform, we show that a substantial delay in ESD can be achieved via pushing the system towards an exceptional point. This finding has been further extended to higher (third) order exceptional point by considering a more complicated tripartite entanglement into account.