Pixelation occurs in many imaging systems and limits the spatial resolution of the acquired images. This effect is notably present in quantum imaging experiments with correlated photons in which the number of pixels used to detect coincidences is often limited by the sensor technology or the acquisition speed. Here, we introduce a pixel super-resolution technique based on measuring the full spatially-resolved joint probability distribution (JPD) of spatially-entangled photons. Without shifting optical elements or using prior information, our technique increases the pixel resolution of the imaging system by a factor two and enables retrieval of spatial information lost due to undersampling. We demonstrate its use in various quantum imaging protocols using photon pairs, including quantum illumination, entanglement-enabled quantum holography, and in a full-field version of N00N-state quantum holography. The JPD pixel super-resolution technique can benefit any full-field imaging system limited by the sensor spatial resolution, including all already established and future photon-correlation-based quantum imaging schemes, bringing these techniques closer to real-world applications.

像素化发生在许多成像系统中，并限制了所获取图像的空间分辨率。这种效应明显存在于相关光子的量子成像实验中，其中用于检测重合的像素数量通常受到传感器技术或采集速度的限制。在这里，我们介绍了一种基于测量空间纠缠光子的全空间分辨联合概率分布 (JPD) 的像素超分辨率技术。在不移动光学元件或使用先验信息的情况下，我们的技术将成像系统的像素分辨率提高了两倍，并且能够检索由于欠采样而丢失的空间信息。我们展示了它在使用光子对的各种量子成像协议中的用途，包括量子照明、纠缠启用的量子全息术、以及 N00N 态量子全息的全场版本。JPD 像素超分辨率技术可以使任何受传感器空间分辨率限制的全场成像系统受益，包括所有已经建立和未来基于光子相关的量子成像方案，使这些技术更接近现实世界的应用。