Fig. 7: Core of the Experiment Setup.
From: Noise-resilient single-pixel compressive sensing with single photon counting
Photos of the experimental setup: a side view and b top view of the free-space setup. The labels refer to the following components: (1) MLL: Mode-locked laser sends out pulse trains for the probe and pump. (2) FC1: Fiber coupler couples the probe out to free space. (3) DMD: Digital micromirror device projects Walsh 2D masks. (4) SLM: Spatial light modulator uploads digit images from the MNIST dataset. (5) FC2: Fiber coupler couples the probe into a fiber. (6) PPLN module: Periodically poled lithium niobate module upconverts the probe and pump into high frequency. (7) ODL: Optical delay line helps the probe and pump achieve temporal alignment. (8) InGaAs SPD: Indium gallium arsenide single-photon detector is used for direct detection (DD) at the single-photon level. (9) Si SPD: Silicon single-photon detector is used for quantum parametric mode worting (QPMS) detection at the single-photon level. (10) Time Tagger: Device used for collecting data.
