Quantum simulating the electron transport in quantum cascade laser structures

TL;DR

This paper proposes using ultracold fermionic atoms in optical lattices to simulate electron transport in quantum cascade lasers, providing a platform to explore fundamental mechanisms and optimize laser performance.

Contribution

It introduces a novel quantum simulation scheme for QCLs using cold atoms, analyzing the competition between tunneling and decay, and identifying optimal parameters for transport and emission.

Findings

Existence of optimal parameter relationships for maximum current and emission.

Validation of the simulation scheme through a simplified 1D model.

Potential to study electron-electron interactions and noise in QCLs.

Abstract

We propose to use ultracold fermionic atoms in one-dimensional optical lattices to quantum simulate the electronic transport in quantum cascade laser (QCL) structures. The competition between the coherent tunneling among (and within) the wells and the dissipative decay at the basis of lasing is discussed. In order to validate the proposed simulation scheme, we quantitatively address such competition in a simplified one-dimensional model. We show the existence of optimal relationships between the model parameters, maximizing the particle current, the population inversion (or their product), and the stimulated emission rate. This substantiates the concept of emulating the QCL operation mechanisms in cold-atom optical lattice simulators, laying the groundwork for addressing open questions, such as the impact of electron-electron scattering and the origin of transport-induced noise, in the design of new-generation QCLs.