Ruthenates: simple superconducting qubits

We propose triplet superconductors, such as ruthenates, as a prospective material for qubit construction. The vectorial nature of the order parameter in triplet superconductors makes it conceptually very easy to imagine the performance of the qubits. The Cooper condensate of pairs in triplet superconductors has all the attributes of the Bose-Einstein condensates and should facilitate long decoherence times of these qubits versus other "vectorial" schemes for qubits, such as small ferromagnets. There are other benefits, which the Superconducting state provides for a requirement like entanglement between qubits via the proximity effect. (C) 2004 Elsevier B.V. All rights reserved.