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Multiphoton transitions in a macroscopic quantum two-state system

Authors
  • Saito, S.
  • Thorwart, M.
  • Tanaka, H.
  • Ueda, M.
  • Nakano, H.
  • Semba, K.
  • Takayanagi, H.
Type
Published Article
Publication Date
Mar 17, 2004
Submission Date
Mar 17, 2004
Identifiers
DOI: 10.1103/PhysRevLett.93.037001
arXiv ID: cond-mat/0403425
Source
arXiv
License
Unknown
External links

Abstract

We have observed multiphoton transitions between two macroscopic quantum-mechanical superposition states formed by two opposite circulating currents in a superconducting loop with three Josephson junctions. Resonant peaks and dips of up to three-photon transitions were observed in spectroscopic measurements when the system was irradiated with a strong RF-photon field. The widths of the multiphoton absorption dips are shown to scale with the Bessel functions in agreement with theoretical predictions derived from the Bloch equation or from a spin-boson model.

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