Multimode entanglement of light and atomic ensembles via off-resonant coherent forward scattering
Multimode entanglement of light and atomic ensembles via off-resonant coherent forward scattering
复制标题
通过非共振相干前向散射实现光和原子系综的多模纠缠
DOI：
10.1103/physreva.71.032348
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发表时间：
2004
影响因子：
2.9
通讯作者：
E. Polzik
中科院分区：
文献类型：
--
作者：
D. Kupriyanov;O. Mishina;I. Sokolov;B. Julsgaard;E. Polzik
提出了具有任意角动量的极化原子系综中光的相干前向散射的量子理论处理方法。我们考虑了弱辐射场与真实的多层原子跃迁相互作用的相干前向散射。基于有效哈密顿量的概念和海森堡的形式主义，我们讨论了传播光的偏振斯托克斯分量的量子涨落和散射原子的集体自旋涨落的耦合动力学。我们表明，在相干前向散射过程中，这种动力学可以用原子样品中产生的极化型自旋波来描述。我们的工作提出了光和原子角动量的集体量子态系统中纠缠过程的一般例子，以前只考虑自旋为1/2的原子的情况。我们使用发展的一般形式来测试自旋1/2近似对具有较高角动量的原子的量子非拆除测量建模的适用性。
Quantum theoretical treatment of coherent forward scattering of light in a polarized atomic ensemble with an arbitrary angular momentum is developed. We consider coherent forward scattering of a weak radiation field interacting with a realistic multi-level atomic transition. Based on the concept of an effective Hamiltonian and on the Heisenberg formalism, we discuss the coupled dynamics of the quantum fluctuations of the polarization Stokes components of propagating light and of the collective spin fluctuations of the scattering atoms. We show that in the process of coherent forward scattering this dynamics can be described in terms of a polariton-type spin wave created in the atomic sample. Our work presents a general example of entangling process in the system of collective quantum states of light and atomic angular momenta, previously considered only for the case of spin 1/2 atoms. We use the developed general formalism to test the applicability of spin 1/2 approximation for modelling the quantum non-demolishing measurement of atoms with a higher angular momentum.