title: Proposal for quantum gates in permanently coupled antiferromagnetic spin rings without need of local fields.
abstract: We propose a scheme for the implementation of quantum gates which is based on the qubit encoding in antiferromagnetic molecular rings. We show that a proper engineering of the intercluster link would result in an effective coupling that vanishes as far as the system is kept in the computational space, while it is turned on by a selective excitation of specific auxiliary states. These are also shown to allow the performing of single-qubit and two-qubit gates without an individual addressing of the rings by means of local magnetic fields.
authors.affiliation: INFM-National Research Center on nano-Structres and bio-Systems at Surfaces (S3) and Dipartimento di Fisica, Università degli Studi di Modena e Reggio Emilia, Italy. troiani.filippo@unimore.it
authors.forename: Filippo
authors.initials: F
authors.lastname: Troiani
authors.forename: Marco
authors.initials: M
authors.lastname: Affronte
authors.forename: Stefano
authors.initials: S
authors.lastname: Carretta
authors.forename: Paolo
authors.initials: P
authors.lastname: Santini
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Amoretti