Multiphoton transitions in a macroscopic quantum two-state system

Details Multiphoton transitions in a macroscopic quantum two-state system Multiphoton transitions in a macroscopic quantum two-state system

2004-03-17

arxiv.org/abs/cond-mat/0403425v1

Phys. Rev. Lett. 93, 037001 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.93.037001

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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