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We use the inchworm Quantum Monte Carlo method to investigate the fullcounting statistics of particle and energy currents in a strongly correlatedquantum dot. Our method is used to extract the heat fluctuations and entropyproduction of a quantum thermoelectric device, as well as cumulants of theparticle and energy currents. The energy--particle current cross correlationsreveal information on the preparation of the system and the interplay ofthermal and electric currents. We furthermore demonstrate the signature of acrossover from Coulomb blockade to Kondo physics in the energy currentfluctuations, and show how the conventional master equation approach to fullcounting statistics systematically fails to capture this crossover.

Numerically exact counting statistics of energy current in the Kondo regime