Fig. 1. Schematic diagram of the apparatus in HBT experiment^[1]

Fig. 2. Diagram of classical ghost imaging with two arms^[41]

Fig. 3. Diagram of ghost imaging based on time-domain ensemble statistics

Fig. 4. Diagram of ghost imaging camera^[18]

Fig. 5. Simulation target image of real-space ghost imaging

Fig. 6. Comparison of variance distribution of simulated results in real-space ghost imaging with theoretical results at different SNRs in object light path. (a) ; (b) 不同物光路探测信噪比下，实空间鬼成像关联结果的仿真方差分布与理论比较。(a)信噪比 ；(b)信噪比

Fig. 7. Simulated target in Fourier diffraction ghost imaging (a) and its Fourier spectrum (b)

Fig. 8. Comparison of variance distribution of simulated results in Fourier diffraction ghost imaging with theoretical results at different SNRs. (a) ；(b) 不同物光路探测信噪比下，傅里叶衍射鬼成像关联结果的仿真方差分布与理论比较。 (a)信噪比 ；(b)信噪比

Fig. 9. Fisher information of different ranges of values of as a function of relative intensity ^[77]不同取值范围的 的Fisher信息与相对强度系数 的关系曲线^[77]

Fig. 10. Diffraction spectrum images obtained via conditional averaging on two equally-divided parts. (a) Positive image; (b) Negative image; (c) Subtraction image of positive images and negative images; (d) Diffraction spectrum image of reference object^[77]

Fig. 11. Simulation results. (a) Retrieved image via conditional average; (b) Retrieved image via original fluctuation relation^[77]

Fig. 12. Experiment results. (a) Retrieved image via conditional average; (b) Retrieved image via original fluctuation correlation^[77]

Fig. 13. Statistical resolution limit of ghost imaging camera in (x, λ) light-field space^[10], and are the nearest resolved spatial distance and spectral distance among K points, respectively, with K=2,3,5,7. is Rayleigh’s spatial resolution criterion, and is the spectral resolution of ghost imaging camera 鬼成像相机在高维空间(x ,λ)中的统计分辨率极限^[10]，其中 和 分别为在高维空间中 个点能分辨的最近空间距离和光谱距离，分别取 =2,3,5,7。 为空间分辨率瑞利判据， 为鬼成像相机的光谱分辨率