Fig. 1. Basic physical infrastructure of QRNG

Fig. 2. Statistical histogram of random sequence. (a) Raw; (b) final

Fig. 3. Schematic of compact QRNG system with simple optical paths

Fig. 4. PCB plot of QRNG

Fig. 5. Auto-correlation coefficients

Fig. 6. Results of NIST test

Fig. 7. Results of DIEHARD test

Fig. 8. Statistical distributions of raw random sequences with different working time lengths

Fig. 9. Minimum entropy among raw random sequences with different working time lengths