  Quantum cycles in established heat engines can be modeled with various
quantum systems as working substances. For example, a heat engine can be
modeled with an infinite potential well as the working substance to determine
the efficiency and work done. However, in this method, the relationship between
the quantum observables and the physically measurable parameters i.e., the
efficiency and work done is not well understood from the quantum mechanics
approach. A detailed analysis is needed to link the thermodynamic variables (on
which the efficiency and work done depends) with the uncertainty principle for
better understanding. Here, we present the connection of the sum uncertainty
relation of position and momentum operators with thermodynamic variables in the
quantum heat engine model. We are able to determine the upper and lower bounds
on the efficiency of the heat engine through the uncertainty relation.
