Robust Tripartite Entanglement Generation via Correlated Noise in Spin Qubits

TL;DR

This paper demonstrates a robust method for generating long-lived tripartite entanglement in spin qubits through correlated noise, highlighting the formation of a dark state that is resilient to environmental effects and useful for quantum computing.

Contribution

It reveals how correlated noise can be harnessed to produce stable tripartite entanglement via dark states, contrasting with previous reliance on coherent coupling.

Findings

Formation of a highly entangled dark state (W state) in spin qubits.

Environmentally induced coherent coupling is not essential for entanglement.

Methods like post-selection and coherent driving can enhance tripartite entanglement.

Abstract

We investigate the generation of genuine tripartite entanglement in a triangular spin-qubit system due to spatially correlated noise. In particular, we demonstrate how the formation of a highly entangled dark state -- a W state -- enables robust, long-lived tripartite entanglement. Surprisingly, we find that environmentally induced coherent coupling does not play a crucial role in sustaining this entanglement. This contrasts sharply with the two-qubit case, where the induced coupling significantly influences the entanglement dynamics. Furthermore, we explore two promising approaches to enhance the tripartite entanglement by steering the system towards the dark state: post-selection and coherent driving. Our findings offer a robust method for generating high-fidelity tripartite entangled states with potential applications in quantum computation.