Multiphoton transitions in a macroscopic quantum two-state system.
Multiphoton transitions in a macroscopic quantum two-state system.
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DOI：
10.1103/physrevlett.93.037001
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发表时间：
2004-03
影响因子：
8.6
通讯作者：
S. Saito;Michael Thorwart;Hirotaka Tanaka;Masahito Ueda;Masahito Ueda;H. Nakano;K. Semba;Hideaki Takayanagi
中科院分区：
文献类型：
--
作者：
S. Saito;Michael Thorwart;Hirotaka Tanaka;Masahito Ueda;Masahito Ueda;H. Nakano;K. Semba;Hideaki Takayanagi
我们观察到两个宏观量子力学叠加态之间的多光子跃迁，这两个叠加态是由具有三个约瑟夫森结的超导回路中两个相反的循环电流形成的。当系统受到强射频光子场照射时，在光谱测量中观察到多达三光子跃迁的共振峰和谷。多光子吸收谷的宽度与贝塞尔函数成比例，与从布洛赫方程或自旋玻色子模型导出的理论预测一致。
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.