Estimating Thermal Observables using less qubits

In this work, we present an alternative method for Gibbs state observable estimation. We provide resource estimates for the quantum circuit necessary to execute our method. To provide a robust assessment of our approach, we benchmark our results against state-of-the-art methodology. Through these comparisons, we aim to highlight the strengths and potential improvements of our method for Gibbs-state accessing in the context of quantum state preparation and estimation of thermal observables.