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.
@article{arxiv.cond-mat/0605709,
title = {Pair-wise decoherence in coupled spin qubit networks},
author = {Andrea Morello and P. C. E. Stamp and Igor S. Tupitsyn},
journal= {arXiv preprint arXiv:cond-mat/0605709},
year = {2007}
}