Macroscopic Quantum Tunneling of a Fluxon in a Long Josephson Junction

Takeo Kato, Masatoshi Imada

研究成果査読

47 被引用数 (Scopus)

抄録

Macroscopic quantum tunneling (MQT) for a single fluxon moving along a long Josephson junction is studied theoretically. To introduce a fluxon-pinning force, we consider inhomogeneities made by modifying thickness of an insulating layer locally. Two different situations are studied: one is the quantum tunneling from a metastable state caused by a single inhomogeneity, and the other is the quantum tunneling in a two-state system made by two inhomogeneities. In the quantum tunneling from a metastable state, the decay rate is estimated within the WKB approximation. Dissipation effects on a fluxon dynamics are taken into account by the Caldeira-Leggett theory. We propose a device to observe quantum tunneling of a fluxon experimentally. Required experimental resolutions to observe MQT of a fluxon seem attainable within the presently available micro-fabrication technique. For the two-state system, we study quantum resonance between two stable states, i.e., macroscopic quantum coherence (MQC). From the estimate for dissipation coefficients due to quasiparticle tunneling, the observation of MQC appears to be possible within the Caldeira-Leggett theory.

本文言語English
ページ(範囲)2963-2975
ページ数13
ジャーナルjournal of the physical society of japan
65
9
DOI
出版ステータスPublished - 1996
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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