Studies of decoherence in strongly anisotropic spin triangles with toroidal or general non-collinear easy axes

TL;DR

This study uses numerical simulations to evaluate whether toroidal anisotropy axes in magnetic molecules enhance quantum coherence, finding no universal benefit but highlighting the advantage of tilted axes in many scenarios.

Contribution

It provides a systematic numerical analysis of anisotropy axis arrangements in magnetic molecules for quantum coherence applications.

Findings

Toroidal anisotropy axes do not universally improve coherence.

Tilted anisotropy axes often outperform other configurations.

No single anisotropy structure is optimal for all cases.

Abstract

Magnetic molecules are investigated with respect to their usability as units in future quantum devices. In view of quantum computing, a necessary prerequisite is a long coherence time of superpositions of low-lying levels. In this article, we investigate by means of numerical simulations whether a toroidal structure of single-ion easy anisotropy axes is advantageous as often conjectured. Our results demonstrate that there is no general advantage of toroidal magnetic molecules, but that arrangements of tilted anisotropy axes perform best in many cases.