Toroidal qubits: naturally-decoupled quiet artificial atoms
  The requirements of quantum computations impose high demands on the level of qubit protection from perturbations; in particular, from those produced by the environment. Here we propose a superconducting flux qubit design that is naturally protected from ambient noise. This decoupling is due to the qubit interacting with the electromagnetic field only through its toroidal moment, which provides an unusual qubit-field interaction. 
Alexandre M. Zagoskin, Arkadi Chipouline, Evgeni Il'ichev, J. Robert   Johansson, and Franco Nori
quant-ph cond-mat.mes-hall cond-mat.supr-con