Coherent field-controlled rectification and directional emission in a one-dimensional waveguide

Abstract

Derived from the time-dependent Schrodinger equation, we study the single-photon pulse (SPP) propagation through a pair of V-type three-level atoms coupled to a one-dimensional (1D) waveguide. Our results demonstrate that the rectification and the directional emission can be achieved and controlled by the phase difference between two external fields in the system under the proper conditions. Furthermore, we investigate the impact of Rabi frequency, interatomic distance, the detuning between the SPP and the atoms, and the SPP bandwidth on the rectification and the directional emission. We treat the system as a quantum interferometer to explain the rectification and the directional emission. The system has a potential application to be the basis of all-optical devices such as a diode, isolator, modulator, or emitter for the quantum information.