Traditional ghost imaging requires correlated but spatially separated photons and has been observed in many physical situations, spanning both the quantum and classical regimes. Here we observe ghost imaging in a new system—a system based on entanglement swapping, the key feature of a quantum network. We detail how the exact form of quantum interference between independent photons dictates the precise nature of the ghost imaging, for example, for an anti-symmetric projection, the recorded image is the contrast-reversed version of the object—where the object is bright, the image is dark, and vice versa. The results highlight the importance of state projection in this ghost-imaging process and provide a pathway for the teleportation of two-dimensional spatial states across a quantum network. Our results also indicate that ghost images with new image properties could be achieved in conventional settings through a variety of new signal processing procedures.

传统的鬼影成像需要相关但空间上分离的光子，并且在许多物理情况下都已观察到，涵盖了量子和经典机制。在这里，我们观察到了新系统中的重影成像，该系统是基于纠缠交换的系统，纠缠是量子网络的关键特征。我们详细介绍了独立光子之间的量子干涉的确切形式如何指示幻影成像的精确性质，例如，对于反对称投影，所记录的图像是物体的相反对比度版本，其中物体是明亮的，图像较暗，反之亦然。结果突出了状态投影在此重影成像过程中的重要性，并为跨量子网络的二维空间状态的隐形传态提供了途径。