Toroidal qubits: naturally-decoupled quiet artificial atoms

Understand

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.