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.
@article{arxiv.cond-mat/0405507,
title = {Molecular engineering of antiferromagnetic rings for quantum computation},
author = {F. Troiani and A. Ghirri and M. Affronte and S. Carretta and P. Santini and G. Amoretti and S. Piligkos and G. Timco and R. E. P. Winpenny},
journal= {arXiv preprint arXiv:cond-mat/0405507},
year = {2009}
}