Superconducting pi qubit with a ferromagnetic Josephson junction.

摘要: Solid-state qubits have the potential for large-scale integration and flexibility of layout quantum computing. However, their short decoherence time due to coupling environment remains an important problem be overcome. We propose a new superconducting qubit which incorporates spin-electronic device: consists ring with ferromagnetic pi junction has metallic contact normal Josephson insulating barrier. Thus, coherent two-level state is formed without external magnetic field. This feature simple structure make it possible reduce its size leading long time.