Dressed-state electromagnetically induced transparency for light storage in uniform phase spin-waves

摘要

We present, experimentally and theoretically, a scheme for dressed-stateelectromagnetically induced transparency (EIT) in a three-step cascade systemwhere a four-level system is mapped into an effective three-level system.Theoretical analysis reveals that the scheme provides coherent state controlvia adiabatic following and provides a generalized protocol for light storagein uniform phase spin-waves that are insensitive to motional dephasing. Thethree-step driving enables a number of other features including spatialselectivity of the excitation region within the atomic medium, and kick-freeand Doppler-free excitation that produces narrow resonances in thermal vapor.As a proof of concept we present an experimental demonstration of thegeneralized EIT scheme using the $6S_{1/2} \rightarrow 6P_{3/2} \rightarrow7S_{1/2} \rightarrow 8P_{1/2}$ excitation path in thermal cesium vapor. Thistechnique could be applied to cold and thermal ensembles to enable longerstorage times for Rydberg polaritons.