# Numerically exact counting statistics of energy current in the Kondo regime

## TL;DR

This paper employs the inchworm Quantum Monte Carlo method to precisely analyze the full counting statistics of energy and particle currents in a strongly correlated quantum dot, revealing the crossover from Coulomb blockade to Kondo physics.

## Contribution

It introduces a numerically exact approach to study energy current fluctuations in the Kondo regime, surpassing traditional master equation methods.

## Key findings

- Identification of heat fluctuations and entropy production in quantum thermoelectric devices.
- Observation of the crossover from Coulomb blockade to Kondo physics in energy current fluctuations.
- Demonstration of the failure of conventional master equations in capturing this crossover.

## Abstract

We use the inchworm Quantum Monte Carlo method to investigate the full counting statistics of particle and energy currents in a strongly correlated quantum dot. Our method is used to extract the heat fluctuations and entropy production of a quantum thermoelectric device, as well as cumulants of the particle and energy currents. The energy--particle current cross correlations reveal information on the preparation of the system and the interplay of thermal and electric currents. We furthermore demonstrate the signature of a crossover from Coulomb blockade to Kondo physics in the energy current fluctuations, and show how the conventional master equation approach to full counting statistics systematically fails to capture this crossover.