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Quantum interference explains the stability of matter, guided the construction of the laser, and led to many applications. So what is this quantum interference about? Feynman considered the double-slit experiments for electrons to contain “the only mysteryâ€, insofar as it concerns quantum interference. To get as close to Feynman's description of double-slit diffraction we closed the individual slits on demand (see figure). Following Tonomura’s famous interference build-up movie for a biprism wire, we also recorded a movie of the build-up of the diffraction pattern one particle at a time for the double slit. In recent work done in Paris, macroscopic particle-wave duality with bouncing oil droplets was demonstrated for a double slit. This was supposed not to be possible. What does that mean for microscopic or quantum-mechanical particle-wave duality for electrons? This means a lot to an international group of physicists labeled to be a “band of rebels†according to Morgan Freeman’s show “Through the Wormholeâ€. However this appears not to be the message presented in the past three years to many high school students through our educational movie “The Challenge of Quantum Realityâ€. In the presentation this issue will be discussed. Host: Peter Milonni |