Unexpected Robustness of Multipartite Entanglement against Sudden Death from Spontaneous Emission

TL;DR

This paper challenges the common belief that multipartite entanglement is more fragile, showing instead that it exhibits unexpected robustness against sudden death caused by spontaneous emission.

Contribution

It provides evidence that multipartite entanglement is more resilient to entanglement sudden death from spontaneous emission than previously assumed.

Findings

Multipartite entanglement shows increased robustness against ESD.

Contrasts with the assumption that more parties lead to greater fragility.

Results suggest potential for more stable quantum information protocols.

Abstract

Entanglement is known to decay even in isolated systems, an effect attributed to spontaneous emission. This fragility of entanglement can be exacerbated by entanglement sudden death (ESD), where entanglement drops to zero abruptly within a finite time. It is natural to assume that multipartite entanglement is more vulnerable to ESD, as it involves more parties experiencing spontaneous emission. In this work, we challenge this assumption and present a contrasting conclusion, asserting that multipartite entanglement demonstrates increased robustness against ESD from spontaneous emission.