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Spontaneous generation of flux in a Josephson junction loop

In: Macroscopic Quantum Coherence and Quantum Computing

Author

Listed:
  • Ras Carmi

    (Technion-Israel Institute of Technology, Physics Department)

  • Emil Polturak

    (Technion-Israel Institute of Technology, Physics Department)

  • Gad Koren

    (Technion-Israel Institute of Technology, Physics Department)

Abstract

We report experimental measurements of flux generated spontaneously inside a YBa2Cu3O7-δ superconducting loop made of 214 Josephson junctions connected in series. The flux is generated spontaneously during cooldown from the normal into the superconducting state. Stable random values of the flux measured at the end of each cooldown follow a normal distribution. The data are consistent with the total phase difference around the loop being a sum of the instantaneous values of the fluctuating phase differences across each junction. This agreement is conditional upon the assumption that the phase can be unambiguously defined relative to a phase standard. Our result indicates that topologically equivalent circuits will always contain random flux in their initial state.

Suggested Citation

  • Ras Carmi & Emil Polturak & Gad Koren, 2001. "Spontaneous generation of flux in a Josephson junction loop," Springer Books, in: Dmitri V. Averin & Berardo Ruggiero & Paolo Silvestrini (ed.), Macroscopic Quantum Coherence and Quantum Computing, pages 443-448, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4615-1245-5_44
    DOI: 10.1007/978-1-4615-1245-5_44
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