Quantum theory for the Josephson phase dynamics in a d-dot

Tomio Koyama, M. Machida, M. Kato, T. Ishida

Research output: Contribution to journalConference articlepeer-review

11 Citations (Scopus)


We formulate a canonical quantum theory for the square-shape closed 0-π junction system in the absence of an external magnetic field. When the quantum tunneling takes place between the two degenerate classical ground states having different current patterns, the system forms a quantum two-level system. The Hamiltonian which describes the quantum two-level system is derived from the generalized sine-Gordon equation.

Original languageEnglish
Pages (from-to)1561-1565
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue numberII
Publication statusPublished - 2005 Oct 7
EventProceedings of the 17th Internatioanl Symposium on Superconductivity (ISS 2004) Advances in Superconductivity -
Duration: 2004 Nov 232004 Nov 25


  • 0-π junction
  • Two-level system
  • d-dot

ASJC Scopus subject areas

  • Condensed Matter Physics


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