First observation of antimatter wave interference
A. Ariga, A. Ereditato, R. Ferragut, M. Giammarchi, M. Leone, C., Pistillo, S. Sala, P. Scampoli

TL;DR
This paper reports the first observation of matter wave interference with single positrons using a Talbot-Lau interferometer, confirming quantum behavior of antimatter and opening avenues for gravitational studies of antimatter.
Contribution
It demonstrates for the first time matter wave interference of antimatter particles, specifically positrons, using a novel interferometer setup.
Findings
Observed energy-dependent fringe contrast confirming quantum interference
Excluded classical explanations for the interference pattern
Showed the feasibility of antimatter interferometry for gravitational measurements
Abstract
In 1924 Louis de Broglie introduced the concept of wave-particle duality: the Planck constant relates the momentum of a massive particle to its de Broglie wavelength . The superposition principle is one of the main postulates of quantum mechanics; diffraction and interference phenomena are 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 was a highly sought-after result. Initially proposed by Richard Feynman as a thought experiment it was finally carried out in 1976. A few years later, positron diffraction was first observed. However, an analog of the double-slit experiment has not been performed to date on any system containing antimatter. Here we present the first observation…
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Taxonomy
TopicsMuon and positron interactions and applications · Atomic and Molecular Physics · Particle accelerators and beam dynamics
