Controlled multiqubit entangled states and quantum transmission in quantum molecule-spin systems

TL;DR

This paper demonstrates the coherent control and transfer of multiqubit entangled states in a system of interacting molecular spin rings, with potential applications in quantum information processing.

Contribution

It introduces a method to generate and transfer multiqubit entangled states in quantum spin systems with tunable couplings, analyzed via an effective anisotropic Heisenberg Hamiltonian.

Findings

High-precision generation of entangled W states achieved.

Entangled states successfully transferred between molecular rings.

Analytical model of quantum dynamics in spin molecule systems provided.

Abstract

he multiqubit entangled states are coherently controlled in the quantum spin systems composed of $N+1$ interacting antiferromagnetic molecular rings. The tunable intermolecular couplings arise from the local exchange interactions between electron spins of $N$ circumjacent magnets and those of one central molecular ring. The quantum dynamics of such system is analytically deduced by the effective spin hamiltonian with anisotropic Heisenberg couplings. It is found that entangled $W$ states can be generated with a high precision under the circumstance of quantum fluctuations. The multiqubit entangled state is also transferred from some molecular rings to others by the selection of intermolecular couplings.