# Classical-to-quantum crossover in electron on-demand emission

## TL;DR

This paper presents a theoretical mechanism for generating and tuning single-electron wave packets, enabling experimental exploration of the quantum-to-classical transition in electron emission, with implications for quantum technology.

## Contribution

It introduces a method to control the quantum nature of emitted electrons from solid-state sources, facilitating studies of the quantum-to-classical crossover.

## Key findings

- Feasibility of tuning electron wave packets demonstrated
- Potential for experimental investigation of quantum-to-classical transition
- Implications for development of quantum electron devices

## Abstract

Emergence of a classical particle trajectory concept from the full quantum description is a key feature of quantum mechanics. Recent progress of solid state on-demand sources has brought single-electron manipulation into the quantum regime, however, the quantum-to-classical crossover remains unprobed. Here we describe theoretically a mechanism for generating single-electron wave packets by tunneling from a driven localized state, and show how to tune the degree of quantumness. Applying our theory to existing on-demand sources, we demonstrate the feasibility of an experimental investigation of quantum-to-classical crossover for single electrons, and open up yet unexplored potential for few-electron quantum technology devices.