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In recent experiments, electromagnetically induced transparency (EIT) wereobserved with giant atoms, but nothing unconventional were found from thetransmission spectra. In this letter, we show that unconventional EIT doesexist in giant atoms, and indicate why it has not been observed so far.Different from these existing works, this letter presents a consistent theoryincluding a real space method and a time delayed master equation for observingunconventional EIT. We discover that this phenomenon is a quantum effect whichcannot be correctly described in a semi-classical way as those in recent works.Our theory shows that it can be observed when the time delay between twoneighboring coupling points is comparable to the relaxation time of the atom,which is crucial for a future experimental observation. This new phenomenonresults from inherent non-locality of the giant atom, which physically forcespropagating fields to be standing waves in space and the atom exhibitingretardations in time. Our theory establishes a framework for application ofnonlocal systems to quantum information processing.

Spatial Non-Locality Induced Non-Markovian EIT in a Single Giant Atom