Physics Department Seminar: First demonstration of antimatter quantum interference
22/05/2019 at 14:00 Dip. di Fisica, Aula Consiglio
First demonstration of antimatter quantum interference
In 1924 Louis de Broglie introduced the concept of wave-particle duality: the Planck constant relates the momentum of a massive particle to its wavelength. Diffraction and interference phenomena were therefore predicted and have been observed on objects of increasing complexity, from electrons to neutrons and molecules. Beyond the early electron diffraction experiments, the demonstration of single-electron double-slit-like interference (initially proposed by Feynman as a "gedanken" experiment) was finally carried out in 1976. A few years later, positron diffraction was first observed. However, an analog of the double-slit electron experiment has not been performed to date on any system containing antimatter. In this talk I will present the observation of matter wave interference of single positrons: it is the first demonstration of single-particle interference for antimatter.