论文标题
使用声音调制器快速生成和检测光的空间模式
Fast Generation and Detection of Spatial Modes of Light using an Acousto-Optic Modulator
论文作者
论文摘要
空间模式提供了一个高维空间，可用于编码经典和量子信息。当前的动态生成和测量这些模式的方法由于需要重新配置高分辨率相掩码，例如空间照明调制器或数字微龙族设备，因此很慢。通过将一组静态相掩码与快速，图像的光学开关（例如Acousto-Optic Modulator（AOM））相连，可以通过将一组静态相掩码多样化来大大加速空间模式的过程。我们在实验上意识到这种方法，使用双通AOM生成五个轨道角动量状态之一，其切换速率高达500 kHz。然后，我们将该系统应用于二维希尔伯特空间中的空间模式的快速量子状态层析成像，通过将未知状态投影到包含三个相互无偏基的六个空间模式上，通过将未知状态投影到二维Hilbert空间中。我们能够在1 ms以下的任意状态中重建任意状态，平均保真度为96.9％。
Spatial modes of light provide a high-dimensional space that can be used to encode both classical and quantum information. Current approaches for dynamically generating and measuring these modes are slow, due to the need to reconfigure a high-resolution phase mask such as a spatial light modulator or digital micromirror device. The process of updating the spatial mode of light can be greatly accelerated by multiplexing a set of static phase masks with a fast, image-preserving optical switch, such as an acousto-optic modulator (AOM). We experimentally realize this approach, using a double-pass AOM to generate one of five orbital angular momentum states with a switching rate of up to 500 kHz. We then apply this system to perform fast quantum state tomography of spatial modes of light in a 2-dimensional Hilbert space, by projecting the unknown state onto six spatial modes comprising three mutually unbiased bases. We are able to reconstruct arbitrary states in under 1 ms with an average fidelity of 96.9%.
