Robust and Indestructible Macroscopic Entanglement

TL;DR

This paper explores the feasibility of observing and defining robust macroscopic entanglement under realistic conditions, proposing new resilient concepts and demonstrating their practicality with simple quantum states.

Contribution

It introduces a new operational definition of robust macroscopic entanglement and a more resilient concept allowing random selection of shared systems.

Findings

Feasibility of observing macroscopic entanglement with realistic factors

Proposal of a resilient entanglement concept for shared systems

Demonstration using simple quantum states

Abstract

In this letter we investigate the possibility of observing macroscopic entanglement, considering realistic factors such as decoherence, particle losses, and measurements of limited precision (coarse-grained collective measurements). This forms the foundation for an operational definition of robust macroscopic entanglement. We also propose an even more resilient concept of macroscopic entanglement, allowing the parties to randomly select their portion of the shared system. Through a straightforward example, we demonstrate that achieving this is feasible using a simple class of quantum states. Our result opens a path for generalizing notions of quantum entanglement, such as a genuine multipartite entanglement in the macroscopic domain.