# Single atom laser in normal-superconductor quantum dots

## TL;DR

This paper demonstrates that a quantum dot coupled to a superconductor and a normal electrode can produce lasing with a sub-Poissonian photon distribution, especially evident in the subgap transport regime.

## Contribution

It introduces a novel hybrid nanostructure system capable of lasing with unique quantum statistical properties, expanding understanding of quantum dot-based light sources.

## Key findings

- Lasing occurs with a sub-Poissonian photon distribution.
- Resonant subgap transport regime shows maximum current pinning.
- System exhibits stable lasing characterized by Fock-state distribution.

## Abstract

We study a single-level quantum dot strongly coupled to a superconducting lead and tunnel-coupled to a normal electrode which can exchange energy with a single-mode resonator. We show that a such system can sustain lasing characterized by a sub-Poissonian Fock-state distribution of the resonator. The lasing regime is clearly identifiable in the subgap transport regime: in the resonant case, the current is pinned to the maximum value achievable in this hybrid nanostructure.