We investigate hyperfine-induced decoherence in a triangular spin-cluster for different qubit encodings. Electrically controllable eigenstates of spin chirality (C_z) show decoherence times that approach milliseconds, two orders of magnitude longer than those estimated for the eigenstates of the total spin projection (S_z) and of the partial spin sum (S_{12}). The robustness of chirality is due to its decoupling from both the total- and individual-spin components in the cluster. This results in a suppression of the effective interaction between C_z and the nuclear spin bath.
@article{arxiv.1205.5629,
title = {Hyperfine-induced decoherence in triangular spin-cluster qubits},
author = {Filippo Troiani and Dimitrije Stepanenko and Daniel Loss},
journal= {arXiv preprint arXiv:1205.5629},
year = {2015}
}