title: Pairwise decoherence in coupled spin qubit networks.
abstract: Experiments involving phase coherent dynamics of networks of spins, such as echo experiments, will only work if decoherence can be suppressed. We show here, by analyzing the particular example of a crystalline network of Fe8 molecules, that most decoherence typically comes from pairwise interactions (particularly dipolar interactions) between the spins, which cause "correlated errors." However, at very low T these are strongly suppressed. These results have important implications for the design of quantum information processing systems using electronic spins.
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver BC V6T 1Z1, Canada.
authors.forename: Andrea
authors.initials: A
authors.lastname: Morello
authors.forename: P C E
authors.initials: PC
authors.lastname: Stamp
authors.forename: Igor S
authors.initials: IS
authors.lastname: Tupitsyn