Entanglement generation via a completely mixed nuclear spin bath

TL;DR

This paper demonstrates that qubits interacting with a completely mixed nuclear spin bath can become highly entangled, proposing protocols for multipartite entanglement generation and discussing experimental feasibility in quantum dots.

Contribution

It introduces a method for entangling qubits through a mixed nuclear spin bath and presents protocols for creating multipartite entangled states.

Findings

Qubits can become highly entangled via a mixed spin bath.

Protocols for generating GHZ states are proposed.

Experimental realization in quantum dots is feasible.

Abstract

We show that qubits coupled sequentially to a mesoscopic static completely mixed spin bath via the Heisenberg interaction can become highly entangled. Straightforward protocols for the generation of multipartite entangled (Greenberger-Horne-Zeilinger-)states are presented. We show the feasibility of an experimental realization in a quantum dot by the hyperfine interaction of an electron with the nuclear spins.