Manipulation Of Rydberg EIT In External Field And Quantum Correlation Between Rydberg Atoms

Rydberg atoms show many exaggerate properties,such as large size,long lifetime and huge polarizability as well as strong interactions between Rydberg atoms,which make it extensive researched.Rydberg Electromagnetically Induced Transparency?EIT?possesses not only the properties of Rydberg atom,but also a characteristic of EIT,which has applications in nonlinear optics,quantum information,quantum computing and single photon source as well as precision measurement.An all-optic and nondestructive based on Rydberg EIT is used to probe interaction between Rydberg atoms and quantum correction.In this thesis,we firstly investigate Rydberg EIT modulated by Radio-Frequency?RF?fields in a room-temperature cesium cell.We lock the 510 nm coupling laser to Rydberg transition via EIT.Then we investigate ultracold Rydberg EIT in MOT and the dependence of Rydberg-EIT on the interaction between Rydberg atoms.The second correction function is measured with HBT method,and quantum correlation of the Rydberg many body system is investigated.Main contents are as follows:1.We investigate Rydberg EIT,modulated by Radio-Frequency fields in a room-temperature cesium cell.The RF-dressed S and D Rydberg state EIT show AC stark shift and splitting and RF sideband,which demonstrate the rich spectra structure and can be used as a calibration-free sensitive measurement of the RF field.Due to the D-dissymmetry,Rydberg EIT spectra exhibit strong dependence of angle between polarization of laser beam and field,which realize measurement of polarization of field.A Floquet analysis is employed to model the Rydberg spectra,which good agreement with the experimental observations.2.We prepare the cold atom system and present a laser frequency locking to Rydberg transition with EIT spectra in a room-temperature cesium vapor cell.The cascade EIT provides a method to lock the laser frequency to the excitation transition.3.Rydberg-EIT is investigated in a MOT.The EIT spectra are strongly depend on the interaction between Rydberg atoms.We investigate the dynamics of the radiation pressure due to the interaction between probe light and cold atoms.The dephasing rate of Rydberg atoms ?₃=?×(?₃₃/?_p)² is defined in Rydberg EIT model to explain experimental measurement,the simulation reproduce the measured EIT spectrum and show agreement between the experiments and calculations.4.We measure the quantum correlation between Rydberg atoms via Rydberg-EIT.The innovations of this work:1.We investigate Rydberg EIT modulated by RF fields.RF-dressed Rydberg EIT spectra show a rich of spectra structure,which can be used to realize a rapid and robust atom-based method of calibration the electric field and measuring the polarization of RF field.Rydberg EIT in a room-temperature cesium vapor cell is used as an all-optical field probe.2.We have performed laser frequency stabilization to excited Rydberg transition based on a Rydberg cascade three-level EIT.3.Investigation the effect of interaction between Rydberg atoms on the Rydberg-EIT spectra theoretically and experimently.We measured the quantum correlation between Rydberg atoms via Rydberg-EIT.