Multiphoton transitions in a macroscopic quantum two-state system
S. Saito, M. Thorwart, H. Tanaka, M. Ueda, H. Nakano, K. Semba, and H., Takayanagi
TL;DR
This paper reports the experimental observation of multiphoton transitions in a superconducting quantum two-state system, demonstrating resonant peaks up to three-photon processes and confirming theoretical models with spectroscopic data.
Contribution
It provides the first experimental evidence of multiphoton transitions in a macroscopic quantum system and validates theoretical predictions using Bessel functions and spin-boson models.
Findings
Observation of up to three-photon resonant peaks
Absorption dip widths scale with Bessel functions
Agreement with Bloch equation and spin-boson model predictions
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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