title: Molecular engineering of antiferromagnetic rings for quantum computation.
abstract: The substitution of one metal ion in a Cr-based molecular ring with dominant antiferromagnetic couplings allows the engineering of 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.
authors.affiliation: INFM-S3 National Research Center on nanoStructures and bioSystems at Surfaces and Dipartimento di Fisica, Università di Modena e Reggio Emilia, via G. Campi 213/A, I-41100 Modena, Italy. troiani.filippo@unimore.it
authors.forename: F
authors.initials: F
authors.lastname: Troiani
authors.forename: A
authors.initials: A
authors.lastname: Ghirri
authors.forename: M
authors.initials: M
authors.lastname: Affronte
authors.forename: S
authors.initials: S
authors.lastname: Carretta
authors.forename: P
authors.initials: P
authors.lastname: Santini
authors.forename: G
authors.initials: G
authors.lastname: Amoretti
authors.forename: S
authors.initials: S
authors.lastname: Piligkos
authors.forename: G
authors.initials: G
authors.lastname: Timco
authors.forename: R E P
authors.initials: RE
authors.lastname: Winpenny