Quantum Coherence in an Exchange-Coupled Dimer of Single-Molecule Magnets

TL;DR

This study uses high-frequency electron paramagnetic resonance to observe quantum coherence in a dimer of single-molecule magnets, demonstrating potential for quantum device applications through supramolecular chemistry.

Contribution

It provides experimental evidence of quantum coherence in single-molecule magnet dimers using a novel spectroscopic approach, linking molecular interactions to quantum device design.

Findings

Resolved quantum transitions involving superposition states

Isotropic superexchange coupling observed

Implications for molecular quantum device design

Abstract

A multi-high-frequency electron paramagnetic resonance method is used to probe the magnetic excitations of a dimer of single-molecule magnets. The measured spectra display well resolved quantum transitions involving coherent superposition states of both molecules. The behavior may be understood in terms of an isotropic superexchange coupling between pairs of single-molecule magnets, in analogy with several recently proposed quantum devices based on artificially fabricated quantum dots or clusters. These findings highlight the potential utility of supramolecular chemistry in the design of future quantum devices based on molecular nanomagnets.