A matterless double slit

TL;DR

This paper proposes a novel matterless double-slit experiment where photons from virtual electron-positron pairs create an interference pattern, enabling observation of photon-photon scattering and vacuum properties.

Contribution

It introduces a matterless double-slit setup using high-intensity laser fields to generate photons from virtual pairs, a concept not previously demonstrated.

Findings

Photon-photon scattering can be observed using this setup

The experiment demonstrates control of light with light in vacuum

It offers a new way to explore quantum vacuum structure

Abstract

Double-slits provide incoming photons with a choice. Those that survive the passage have chosen from two possible paths which interfere to distribute them in a wave-like manner. Such wave-particle duality continues to be challenged and investigated in a broad range of disciplines with electrons, neutrons, helium atoms, C60 fullerenes, Bose-Einstein condensates and biological molecules. All variants have hitherto involved material constituents. We present a matterless double-slit scenario in which photons generated from virtual electron-positron pair annihilation in head-on collisions of a probe laser field with two ultra-intense laser beams form a double-slit interference pattern. Such electromagnetic fields are predicted to induce material-like behaviour in the vacuum, supporting elastic scattering between photons. Our double-slit scenario presents on the one hand a realisable method to observe photon-photon scattering, and demonstrates on the other, the possibility of both controlling light with light and non-locally investigating features of the quantum vacuum's structure.