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arXiv 0810.2447quant-ph
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利用光子横向空间态的二维宇称实现稳定的模式分选

Stable Mode Sorting by Two-Dimensional Parity of Photonic Transverse Spatial States

C. C. Leary, L. A. Baumgardner, M. G. Raymer

摘要:

本文描述了一种基于离面Sagnac干涉仪的二维光横空间态奇偶性模式分选器。根据所讨论的模式的二维奇偶性,厄米-高斯(HG)和拉盖尔-高斯(LG)模式都可以被引导到两个输出端口中的一个。我们的干涉仪排序HG_nm输入模式取决于他们是否有偶数或奇数阶n+m;它等价地排序LG模式取决于他们是否有一个偶数或奇数值的轨道角动量。它在单光子水平上有效地发挥作用,因此可以用于对单光子状态进行分类。由于这种类型的干涉仪与Mach-Zehnder类型的干涉仪相比具有固有的相稳定性性,因此它为量子信息处理的目的提供了用于操纵和过滤高阶横向空间模式的有前途的工具。例如,几个类似的Sagnacs级联在一起,可以允许第一次,一个真正的单光子状态的轨道角动量的稳定测量。此外,作为众所周知的全息技术的替代方案,可以使用Sagnac结合多模光纤作为空间模式滤波器,其可以用于产生空间模式纠缠贝尔态和任意一阶(n+m=1)空间状态中的预示单光子,覆盖一阶横模的整个庞加莱球。

英文摘要:

We describe a mode sorter for two-dimensional parity of transverse spatial states of light based on an out-of-plane Sagnac interferometer. Both Hermite-Gauss (HG) and Laguerre-Gauss (LG) modes can be guided into one of two output ports according to the two-dimensional parity of the mode in question. Our interferometer sorts HG_nm input modes depending upon whether they have even or odd order n+m; it equivalently sorts LG modes depending upon whether they have an even or odd value of their orbital angular momentum. It functions efficiently at the single-photon level, and therefore can be used to sort single-photon states. Due to the inherent phase stability of this type of interferometer as compared to those of the Mach-Zehnder type, it provides a promising tool for the manipulation and filtering of higher order transverse spatial modes for the purposes of quantum information processing. For example, several similar Sagnacs cascaded together may allow, for the first time, a stable measurement of the orbital angular momentum of a true single-photon state. Furthermore, as an alternative to well-known holographic techniques, one can use the Sagnac in conjunction with a multi-mode fiber as a spatial mode filter, which can be used to produce spatial-mode entangled Bell states and heralded single photons in arbitrary first-order (n+m=1) spatial states, covering the entire Poincare sphere of first-order transverse modes.

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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