This PDF file includes:

• Section S1. Principle of spin noise measurement based on the NV center
• Section S2. Calculation of the spin noise intensity 〈B⊥2〉 from the single-τ measurement
• Section S3. Point spread function of a single ferritin
• Fig. S1. Experimental setup.
• Fig. S2. Images of the nanopillars on diamonds.
• Fig. S3. The treatment of FAC significantly increased the ferritins in HepG2 cells.
• Fig. S4. Electron spin resonance spectra of resin-embedded HepG2 cells.
• Fig. S5. The AFM characterization of the surface of cell sample.
• Fig. S6. Adjusting the distance between the NV center and the cell section.
• Fig. S7. Calculated spin noise intensity as a function of the distance between NV center and ferritin.
• Fig. S8. Simulation of noise intensity at different vertical distances between a single ferritin and NV center.
• Fig. S9. Trace data of Fig. 4A.
• Reference (29)

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