  We demonstrate a genuine quantum feature of heat: the power emitted by a
qubit (quantum two-level system) into a reservoir under continuous driving
shows peaks as a function of frequency $f$. These resonant features appear due
to the accumulation of the dynamical phase during the driving. The position of
the $n$th maximum is given by $f=f_{\rm M}/n$, where $f_{\rm M}$ is the mean
frequency of the qubit in the cycle, and their positions are independent of the
form of the drive and the number of heat baths attached, and even the presence
or absence of spectral filtering. We show that the waveform of the drive
determines the intensity of the peaks, differently for odd and even resonances.
This quantum heat is expected to play a crucial role in the performance of
driven thermal devices such as quantum heat engines and refrigerators. We also
show that by optimizing the cycle protocol, we recover the favorable classical
limit in fast driven systems without the use of counter-diabatic drive
protocols and we demonstrate an entropy preserving non-unitary process. We
propose that this non-trivial quantum heat can be detected by observing the
steady-state power absorbed by a resistor acting as a bolometer attached to a
driven superconducting qubit.
