Strongly correlated multi-electron bunches from interaction with quantum light

TL;DR

This paper demonstrates that free electrons interacting with quantum light can become highly correlated through mechanisms beyond Coulomb interactions, enabling new control over electron correlations for quantum technologies.

Contribution

It reveals a novel mechanism for electron correlation via quantum light interaction, surpassing Coulomb-based correlations, with potential applications in quantum information and imaging.

Findings

Correlation coefficient enhanced over 13 orders of magnitude

Electrons become highly correlated through energy and momentum exchange

Potential for controlling electron correlations in quantum applications

Abstract

Strongly correlated electron systems are a cornerstone of modern physics, being responsible for groundbreaking phenomena from superconducting magnets to quantum computing. In most cases, correlations in electrons arise exclusively due to Coulomb interactions. In this work, we reveal that free electrons interacting simultaneously with a light field can become highly correlated via mechanisms beyond Coulomb interactions. In the case of two electrons, the resulting Pearson correlation coefficient (PCC) for the joint probability distribution of the output electron energies is enhanced over 13 orders of magnitude compared to that of electrons interacting with the light field in succession (one after another). These highly correlated electrons are the result of momentum and energy exchange between the participating electrons via the external quantum light field. Our findings pave the way to the creation and control of highly correlated free electrons for applications including quantum information and ultra-fast imaging.