Experimental data presented in the figures of the article: "Optical-domain spectral super-resolution via a quantum-memory-based time-frequency processor". The dataset contains results from the experimental investigation of two different approaches (Quantum Memory Temporal Imaging (QMTI) and Pulse-Division Time-Axis-Inversion (PuDATI) interferometer) to estimate frequency differences between two (narrow) spectral lines. Data is organized in a self-explanatory JSON format.Fig5.json - data from Figure 5 of the article. The main result of the article, showing a direct comparison of...