  With increased power consumption of modern computer components, heat-based
circuitry has become ever more relevant due to a lower power expense to process
logic bits of information. In heat-based circuits, computations are performed
by driving heat currents through a circuit using a temperature difference.
Utilizing harmonic oscillators and three-level quantum rectifiers as base
components, we study three different heat-based circuits: a series
configuration of diodes, a parallel configuration of diodes, and a diode bridge
rectifier. We demonstrate the required functionality of each circuit for use as
heat-based analogues of standard electronic components. Furthermore, the diode
bridge rectifier is found to give consistent sign of the output bias
independent of the input bias thus rectifying the input. Our results prove the
theoretical feasibility of combining heat current components into heat-based
circuits. The three circuits should be realizable using several of the current
quantum technology platforms.
