Electromagnetically induced transparency in circuit quantum electrodynamics with nested polariton states
Junling Long, Hsiang S. Ku, Xian Wu, Xiu Gu, Russell E. Lake, Mustafa Bal, Yu-xi Liu, David P. Pappas
Electromagnetically induced transparency (EIT) is a signature of quantum interference in an atomic three-level system. By driving the dressed cavity-qubit states of a two-dimensional circuit QED system, we generate a set of polariton states in the nesting regime. The lowest three energy levels are utilized to form the $\Lambda$-type system. EIT is observed and verified by Akaike's information criterion based testing. Negative group velocities up to $-0.52\pm0.09$~km/s are obtained based on the dispersion relation in the EIT transmission spectrum.