Effect of incoherent pumping field on the optical properties of probe field in a Rydberg atom-based quantum antenna for THz field detection based on EIT

We provide theoretical demonstration of a quantum antenna based on Rydberg atoms for detection of THz field. We investigate optical properties of Rydberg cesium atoms based on electromagnetically induced transparency (EIT) for four-level excitation scheme. In this quantum system, probe and coupling fields applied between levels 6⁢𝑆1/2→6⁢𝑃3/2 (D2 transition of 133Cs) and 6⁢𝑃3/2→20⁢𝐷5/2, respectively. One E-field at THz frequency (1.026THz) drives the 20⁢𝐷5/2→22⁢𝑃3/2 Rydberg transition of caesium atoms. We study effect of intensity of the coupling and THz fields on the optical properties of the probe light. We find that the absorption of the probe light through the atomic vapour cell efficiently affected by the intensity of the THz and coupling fields. Moreover, the effect of the incoherent pumping field on the EIT resonance in the presence of the THz field is also investigated. The proposed model is of major significance for THz detection based on Rydberg atoms – based quantum antenna via incoherent pumping field. In this paper, different technology based on incoherent pumping field is presented to enhance the detection accuracy and efficiency, hoping to inspire more possibilities in the improvement of metrics of Rydberg atom-based electric field sensing and broadness of application scenarios.