  I analyze the correlation function of currents generated by the periodically
driven quantum capacitor emitting single electrons and holes into the chiral
waveguide. I compare adiabatic and non-adiabatic, transient working regimes of
a single-electron emitter and find the striking difference between the
correlation functions in two regimes. Quite generally for the system driven
with frequency $\Omega$ the correlation function depends on two frequencies,
$\omega$ and $\ell \Omega - \omega$, where $\ell$ is an integer. For the
emitter driven non-adiabatically the correlation functions for different $\ell$
are similar and almost symmetric in $\omega$. While in the case of adiabatic
drive the correlation functions for $\ell \ne 0$ are highly asymmetric in
$\omega$ and exceed significantly the one corresponding to $\ell = 0$. Under
optimal operating conditions the correlation function for odd $\ell$ is zero.
