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arXiv quant-ph/0202166quant-ph
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二能级原子光谱的量子随机方法

A quantum stochastic approach to the spectrum of a two-level atom

Alberto Barchielli, Nicola Pero

摘要:

通过量子随机微积分,我们构建了一个模型的原子与两个简并的水平和刺激的激光,我们计算其荧光光谱;让我们强调,一旦模型的幺正原子场动力学已经给出,然后计算光谱没有进一步的近似。如果只有吸收/发射项包括在相互作用中,我们重新获得的Mollow光谱的情况下的单色激光和Kimble-Mandel光谱的情况下的“相扩散模型”的非单色激光。然而,我们的模型也可以描述另一种类型的光散射,由于原子作为一个整体的响应,我们预计是小的,但由于吸收/发射通道的散射干扰的“直接散射”。当这两个散射通道的引入,我们得到修改的Mollow-Kimble-Mandel频谱,它与通常的情况下,共享的主要功能,但它提出了一些不对称性,即使在没有失谐的情况下。

英文摘要:

By means of quantum stochastic calculus we construct a model for an atom with two degenerate levels and stimulated by a laser and we compute its fluorescence spectrum; let us stress that, once the model for the unitary atom-field dynamics has been given, then the spectrum is computed without further approximations. If only the absorption/emission term is included in the interaction, we reobtain the Mollow spectrum in the case of a monochromatic laser and the Kimble-Mandel spectrum in the case of a "phase diffusion model" for a non monochromatic laser. However, our model can describe also another type of light scattering, a "direct scattering" due to the response of the atom as a whole, which we expect to be small, but which interferes with the scattering due to the absorption/emission channel. When both the scattering channels are introduced we obtain a modification of the Mollow-Kimble-Mandel spectrum, which shares the main features with the usual case, but which presents some asymmetries even in the case of no detuning.

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