Superconducting quantum bit with ferromagnetic π-junction

T. Yamashita, S. Takahashi, S. Maekawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We propose a new qubit consisting of a superconducting ring with an ordinary Josephson junction and a ferromagnetic π-junction. In the system, two degenerate stable states appear in the phase space without an external magnetic field due to a competition between the 0- and π-states. Because of quantum tunneling between the two degenerate states, bonding and antibonding states, which are used as a bit, are formed. For manipulating the states of the qubit, only small external magnetic field around zero is required. This feature leads to a large-scale integration and a construction of the qubit with a smaller size which is robust to decoherence by external noises.

Original languageEnglish
Title of host publicationProceedings of the 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages84-87
Number of pages4
ISBN (Print)9812568581, 9789812568588
DOIs
Publication statusPublished - 2006
Event8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005 - Hatoyama, Saitama, Japan
Duration: 2005 Aug 222005 Aug 25

Publication series

NameProceedings of the 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005

Other

Other8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005
Country/TerritoryJapan
CityHatoyama, Saitama
Period05/8/2205/8/25

Keywords

  • Ferromagnet/superconductor hybrid structures
  • Josephson effect
  • Quantum computing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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