# First demonstration of antimatter quantum interference

5/22/2019 ore 14:00 Sala Consiglio

First demonstration of antimatter quantum interference

Dr. Marco Giammarchi INFN Milano

"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."

silvia leoni silvia.leoni@mi.infn.it