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arXiv 1306.3746quant-ph
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单原子偏振器

Single-atom polarizer

W. A. Li, L. F. Wei

摘要:

传统的偏振器提供了一种将未知偏振转换为指定偏振的方法。根据Malus,透射的强度与偏振器的透射轴和入射偏振之间的角度的余弦的平方成正比。在那里,强度指的是许多光子的集体行为。本文提出了一种实现单光子偏振滤波的新方法。我们讨论了单个平面偏振光子如何通过由单个原子产生的偏振分析器(所谓的“单原子偏振器”),并提供了一个单量子版本的Malus定律。研究了一维波导中单光子与可控四能级原子的量子散射。利用实空间理论方法,得到了光子透射谱的解析表达式。然后,我们的数值实验表明,入射光子的透射概率可以通过选择偏振相关的驱动原子的跃迁配置来控制。讨论了这种单原子偏振器在线性光学量子信息处理中的应用。

英文摘要:

Traditional polarizer provides a way to convert an unknown polarization into a specified polarization. According to Malus, the intensity of the transmission is directly proportional to the square of the cosine of angle between the transmission axes of the polarizer and the incident polarization. There, the intensity refers to the collective behavior of many photons. Here we propose a novel approach to realizing polarization-filtering at single-photon level. We discuss how a single planepolarized photon transports through a polarized analyzer generated by a single atom (the so-called "single-atom polarizer"), and provide a single quantum version of Malus's law. We investigate the quantum scattering of a single photon by a controllable four-level atom inside a one-dimensional waveguide. By using real-space theoretical approach, we obtain analytic expressions of the transmission spectrum of the photon. Then, our numerical experiments show that the transmitted probability of the incident photon can be controlled by selecting the polarized-dependent transition configuration of the driven atom. The application of such a single-atom polarizer to linear optical quantum information processing is also discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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