Non-Line-of-Sight Imaging with Picosecond Temporal Resolution

Non-line-of-sight (NLOS) imaging enables monitoring around corners and is promising for diverse applications. The resolution of transient NLOS limited to a centimeter scale, mainly by the temporal detectors. Here, we construct an up-conversion single-photon detector with high ~1.4 ps low noise count rate 5 counts per second (cps). Notably, operates at room temperature, near-infrared wavelength. Using this detector, demonstrate high-resolution low-noise imaging. Our system can provide 180 {\mu}m axial 2 mm lateral resolution, which more than one order magnitude better that in previous experiments. These results open avenues techniques relevant