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Topological order in the insulating Josephson junction array.

B Douçot1, M V Feigel'man, L B Ioffe

  • 1Laboratoire de Physique Théorique et Hautes Energies, CNRS UMR 7589, Universités Paris 6 et 7, 4, place Jussieu, 75252 Paris Cedex 05, France.

Physical Review Letters
|April 12, 2003
PubMed
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We discovered a novel insulating state in Josephson junction arrays, tunable with magnetic fields. This state exhibits protected ground state degeneracy, offering robust quantum properties for potential applications.

Area of Science:

  • Condensed Matter Physics
  • Quantum Materials

Background:

  • Josephson junction arrays are key components in quantum technologies.
  • Understanding unconventional insulating states is crucial for advancing quantum computing.

Purpose of the Study:

  • To propose and characterize a novel unconventional insulating state in Josephson junction arrays.
  • To explore the properties of half-vortices and ground state degeneracy in this system.

Main Methods:

  • Theoretical proposal of a Josephson junction array.
  • Analysis of the insulating state's properties under varying magnetic fields.
  • Computation of energy gaps and degeneracy.

Main Results:

  • A tunable unconventional insulating state was identified.

Related Experiment Videos

  • The insulating state exhibits a gap to half-vortices.
  • A protected ground state degeneracy was observed, robust against external noise.

    • Conclusions:

    • The proposed Josephson junction array hosts a topologically protected degenerate ground state.
    • This system offers a promising platform for robust quantum information processing.
    • Experimental verification of these properties is discussed.