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arXiv 1101.5166quant-ph
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原子蒸气中四波混频的量子关联。理论和实验

Quantum correlations by four-wave-mixing in atomic vapor. Theory and Experiments

Quentin Glorieux

摘要:

我们从理论和实验两方面研究了热原子蒸气中通过四波混频产生连续变量量子关联。两种理论方法已经开发。一方面,我们从“经典”非线性光学的角度研究了四波混频。这样我们就得到了理想线性放大器在χ^(3)介质中的演化方程。另一方面,我们提出了一个双Λ组态的四能级微观模型,计算了激光修饰下原子蒸气的χ^(3)系数。这种计算使我们能够导出感兴趣的参数的强度噪声谱。这项工作的实验部分描述了这种效果的演示对铷85的D1线。我们测量了低于标准量子极限的高达-9.2dB的相对强度压缩,并提出了一种在没有放大的情况下测量量子关联的新方法,这些结果在多模量子光学领域,如量子成像和多模量子存储器中有着广泛的应用。

英文摘要:

We study both theoretically and experimentally the generation of quantum correlations in the continuous variable regime by way of four-wave mixing in a hot atomic vapor. Two theoretical approaches have been developed. On one side, we study the four-wave mixing under the "classical" non-linear optics point of view. In such a way we obtain the evolution equation for an ideal linear amplifier in a χ^(3) medium. On the other side, we present a microscopic model with 4 levels in the double-Λ configuration to calculate the χ^(3) coefficient in a atomic vapor dressed with a laser. This calculation allows us to derive the spectra of intensity noise for interesting parameters. The experimental part of this work describes the demonstration of this effect on the D1 line of rubidium 85. We present a measurement of relative intensity squeezing as high as -9.2dB below the standard quantum limit, and an original regime where quantum correlations have been measured without amplification.These results have broad applications in the field of multimode quantum optics, e.g. quantum imaging or the multimode quantum memories.

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