Numerical investigation of the quantum fluctuations of optical fields transmitted through an atomic medium
Numerical investigation of the quantum fluctuations of optical fields transmitted through an atomic medium
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通过原子介质传输的光场量子涨落的数值研究
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
P. Nussenzveig
中科院分区：
文献类型：
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作者：
A. Lezama;P. Valente;H. Failache;M. Martinelli;P. Nussenzveig
我们数值求解了描述量子化场通过光学厚原子样品传播的海森堡-朗之万方程。两个正交的偏振分量被认为是场和完整的塞曼子能级结构的原子跃迁被考虑在内。原子算符的量子涨落通过适当的朗之万力被包括在内。本文考虑了入射光为线偏振相干态（驱动光），真空为垂直偏振态，计算了两种正交偏振态下输出光的振幅和相位求积的噪声谱。我们分析了不同的配置，这取决于地面和激发原子态的总角动量。我们研究了驱动场偏振分量压缩和正交偏振真空压缩的产生。预测了正交偏振模的纠缠。噪声频谱特征的（塞曼）多层次的配置确定。
We have numerically solved the Heisenberg-Langevin equations describing the propagation of quantized fields through an optically thick sample of atoms. Two orthogonal polarization components are considered for the field and the complete Zeeman sublevel structure of the atomic transition is taken into account. Quantum fluctuations of atomic operators are included through appropriate Langevin forces. We have considered an incident field in a linearly polarized coherent state (driving field) and vacuum in the perpendicular polarization and calculated the noise spectra of the amplitude and phase quadratures of the output field for two orthogonal polarizations. We analyze different configurations depending on the total angular momentum of the ground and excited atomic states. We examine the generation of squeezing for the driving field polarization component and vacuum squeezing of the orthogonal polarization. Entanglement of orthogonally polarized modes is predicted. Noise spectral features specific of (Zeeman) multi-level configurations are identified.