  A recent experimental work has demonstrated the chiral behavior of a giant
artificial atom coupled to a microwave photonic waveguide. This is made
possible through the engineering of complex phases in the two non-local
couplings of the artificial atom to the waveguide. When the phase difference
between the couplings and the accumulated optical phase between the coupling
points are judiciously tuned, maximal chirality is achieved. In parell, giant
atoms coupled to a waveguide are paradigmatic setups to observe non-Markovian
dynamics due to self-interference effects. Here we report on a novel effect in
giant atom physics that solely depends on the complex phases of the couplings.
We show that, by adjusting the couplings' phases, a giant atom can,
counterintuitively, enter the Markovian regime irrespectively of any inherent
time delay.
