Superconducting π qubit with a ferromagnetic Josephson junction

T. Yamashita, K. Tanikawa, S. Takahashi, S. Maekawa

Research output: Contribution to journalArticlepeer-review

136 Citations (Scopus)


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

Original languageEnglish
Article number097001
JournalPhysical Review Letters
Issue number9
Publication statusPublished - 2005 Aug 26


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