Fig. 1. Principle of pulsar intensity-correlated interferometry

Fig. 2. Experimental optical path of intensity-correlated interferometry with ultra-weak light. (a) Optical path; (b) photograph

Fig. 3. Coincidence curves. (a) Coincidence counts at different detecting intervals; (b) Gaussian fitting curve of coincidence counts

Fig. 4. Second-order interference fringes of simulated sources with different angular diameters

Fig. 5. Relationship between relative statistical error and average channel counts

Fig. 6. Measurement results of fixed maximum coincidence counts. (a) Intensity correlation values with fixed maximum coincidence counts; (b) measurement time and photon flux with fixed maximum coincidence counts

Fig. 7. Measurement results of fixed measurement time. (a) Intensity correlation values with fixed measurement time; (b) relative statistical errors with fixed measurement time

Fig. 8. Influence of system temporal resolution. (a) Coincidence peak of raw data; (b) coincidence peaks after convolution processing; (c) results under different system temporal resolutions