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arXiv 0803.1906quant-ph
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两个二能级系统耦合到一个振子中的激发转移

Excitation transfer in two two-level systems coupled to an oscillator

Peter L. Hagelstein, Irfan U. Chaudhary

摘要:

我们考虑一个推广的自旋玻色子模型,其中两个不同的两级系统耦合到一个振荡器,在条件下,振荡器的能量是远远小于两级系统的能量,和振荡器是高度兴奋的。我们发现,两个能级系统的跃迁能量转移,产生一个布洛赫Siegert位移在每个两个能级系统类似的,如果其他的缺席。在与二能级系统和振子之间的能量交换相关的共振下,能级分裂与在布洛赫-西格特共振下的自旋玻色子模型中获得的能级分裂大致相同。然而,两个两能级系统之间的激发转移会产生共振,这种效应在自旋玻色子模型中不存在。我们使用一个单一的变换,导致一个旋转的系统中,负责的移位和分裂的条款可以确定。在与能量交换和激发转移共振的anticrossings的水平分裂占简单的两态模型和简并微扰理论,使用运营商出现在旋转的哈密顿量。

英文摘要:

We consider a generalization of the spin-boson model in which two different two-level systems are coupled to an oscillator, under conditions where the oscillator energy is much less than the two-level system energies, and where the oscillator is highly excited. We find that the two-level system transition energy is shifted, producing a Bloch-Siegert shift in each two-level system similar to what would be obtained if the other were absent. At resonances associated with energy exchange between a two-level system and the oscillator, the level splitting is about the same as would be obtained in the spin-boson model at a Bloch-Siegert resonance. However, there occur resonances associated with the transfer of excitation between one two-level system and the other, an effect not present in the spin-boson model. We use a unitary transformation leading to a rotated system in which terms responsible for the shift and splittings can be identified. The level splittings at the anticrossings associated with both energy exchange and excitation transfer resonances are accounted for with simple two-state models and degenerate perturbation theory using operators that appear in the rotated Hamiltonian.

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