Superconducting π qubit with three Josephson junctions

T. Yamashita, S. Takahashi, S. Maekawa

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

We propose a qubit consisting of a superconducting ring with two zero junctions and one ferromagnetic π junction. In the system, degenerate states appear in the phase space without an external magnetic field because of a competition between the zero and π states. Quantum tunneling between the degenerate states leads to a formation of bonding and antibonding states which are used as a bit. For manipulating the states, only a small magnetic field around zero is required. This feature leads to a large-scale integration and a construction of the smaller-sized qubit which is robust to the decoherence by external noises.

Original languageEnglish
Article number132501
JournalApplied Physics Letters
Volume88
Issue number13
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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