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Multiphoton transitions in a macroscopic quantum two-state system

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arxiv cond-mat/0403425 v1 pith:XPJXBDRH submitted 2004-03-17 cond-mat.mes-hall cond-mat.supr-con

Multiphoton transitions in a macroscopic quantum two-state system

classification cond-mat.mes-hall cond-mat.supr-con
keywords multiphotontransitionsdipsmacroscopicobservedsystemabsorptionagreement
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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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