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The absorption of photons in a three-level atom can be controlled andmanipulated by applying a coherent drive at one of the atomic transitions. Thesituation where the absorption is fully canceled, and the atom thus has beenturned completely transparent, has been coined electromagnetically inducedtransparency (EIT). The characteristics of EIT is a narrow transparency windowassociated with a fluorescence quench at its center frequency, indicating thatinelastic scattering at this particular point is suppressed. The emergence ofEIT-like transparency windows is common in waveguide quantum electrodynamics(QED) when multiple closely spaced quantum emitters are coupled to a waveguide.The transparency depends on the separation and energy detuning of the atoms. Inthis work, we study a number of different setups with two-level atoms inwaveguide QED that all exhibit EIT-like transparency windows. Unlike the caseof a genuine three-level atom, no drive fields are required in the systems weconsider, and the coherent coupling of energy levels is mediated by thewaveguide. We specifically distinguish between systems with genuine EIT-likedynamics and those that exhibit a transparency window but lack the fluorescencequench. The systems that we consider consist of both small and giant atoms,which can be experimentally realized with artificial atoms coupled to eitherphotons or phonons. These systems can offer a simpler route to many EITapplications since the need for external driving is eliminated.

Synthesizing electromagnetically induced transparency without a control field in waveguide QED using small and giant atoms