Controlling quasibound states in a one-dimensional continuum through an electromagnetically-induced-transparency mechanism

We study the coherent scattering process of a single photon confined in an one-dimensional (1D) coupled cavity-array, where a Λ-type three-level atom is placed inside one of the cavities in the array and behaves as a functional quantum node (FQN). We show that, through the electromagnetically-induced-transparency mechanism, the Λ-type FQN bears complete control over the reflection and transmission of the incident photon along the cavity array. We also demonstrate the emergence of a quasibound state of the single photon inside a secondary cavity constructed by two distant FQN's as two end mirrors, from which we are motivated to design an all-optical single photon storage device of quantum coherence.