4. Conclusion
In this paper, we show a full realization of Feynman’s thought experiment and illustrate
key features of quantum mechanics: interference and the wave–particle duality of matter. By
controlling the transmission through the individual slits of a double-slit we were able to observe
the diffraction patterns from slit 1 (P1), slit 2 (P2), and both (P12), thus observing the wave
properties of electrons. Also, by recording single electron detection events diffracting through a
double-slit we were able to build up a diffraction pattern, thus observing the particle properties
of electrons.