Robust multipartite entanglement generation via a collision model

TL;DR

This paper proposes a simple, robust scheme for generating genuine multipartite entanglement across disjoint qubit registers using a shuttle qubit, with enhanced entanglement achieved through projective measurements.

Contribution

The authors introduce a collision model-based protocol for stable multipartite entanglement generation that is resilient to noise and imperfections.

Findings

Stable W-type entanglement can be generated among all qubits.

Projective measurements on the shuttle enhance entanglement.

The protocol is robust against various noise types.

Abstract

We examine a simple scheme to generate genuine multipartite entangled states across disjoint qubit registers. We employ a shuttle qubit that is sequentially coupled, in an energy preserving manner, to the constituents within each register through rounds of interactions. We establish that stable $W$-type entanglement can be generated among all qubits within the registers. Furthermore, we find that the entanglement is sensitive to how the shuttle is treated, showing that a significantly larger degree is achieved by performing projective measurements on it. Finally, we assess the resilience of this entanglement generation protocol to several types of noise and imperfections, showing that it is remarkably robust.