Molecular engineering of antiferromagnetic rings for quantum computation

TL;DR

This study demonstrates how substituting a metal ion in a Cr-based molecular ring can engineer its quantum properties, making it a promising candidate for quantum computing applications through detailed experimental characterization and quantum-gate simulations.

Contribution

We experimentally characterized a Cr7Ni molecular ring, revealing its potential for quantum computing by engineering its level structure and demonstrating suitability for qubit implementation.

Findings

Cr7Ni molecular ring has a suitable energy spectrum for qubit use

Low-temperature measurements determined microscopic spin Hamiltonian parameters

Quantum-gate simulations support its application in quantum computation

Abstract

The substitution of one metal ion in a Cr-based molecular ring with dominant antiferromagnetic couplings allows to engineer its level structure and ground-state degeneracy. Here we characterize a Cr7Ni molecular ring by means of low-temperature specific-heat and torque-magnetometry measurements, thus determining the microscopic parameters of the corresponding spin Hamiltonian. The energy spectrum and the suppression of the leakage-inducing S-mixing render the Cr7Ni molecule a suitable candidate for the qubit implementation, as further substantiated by our quantum-gate simulations.