Multiphoton Bloch-Siegert shifts and level-splittings in spin-one systems

Details Multiphoton Bloch-Siegert shifts and level-splittings in spin-one systems Multiphoton Bloch-Siegert shifts and level-splittings in spin-one systems

2007-09-22

arxiv.org/abs/0709.3557v1

Physics

Quantum Physics

14 pages, 3 figures

Scientific paper

10.1088/0953-4075/41/3/035602

We consider a spin-boson model in which a spin 1 system is coupled to an oscillator. A unitary transformation is applied which allows a separation of terms responsible for the Bloch-Siegert shift, and terms responsible for the level splittings at anticrossings associated with Bloch-Siegert resonances. When the oscillator is highly excited, the system can maintain resonance for sequential multiphoton transitions. At lower levels of excitation, resonance cannot be maintained because energy exchange with the oscillator changes the level shift. An estimate for the critical excitation level of the oscillator is developed.

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