A Frequency Chain Based On Glass Ceramic Transfer Cavity And Modulator RF Impedance Matching

Cavity quantum electrodynamics(cavity-QED) is a field of investigating the interaction between the quantized electromagnetic field and atoms in a micro-cavity. The system of single atom trapped in optical micro-cavity by laser cooling and trapping can be used as the qubit storage unit or single-photon flying qubits, which is excited by an external laser pulse generated through the process of stimulated Raman transition. It provides a way to generate the atom-photon, photon-photon and atom-atom entanglement. However, due to the imperfection and the influence from the environment, it is difficult to control the strong coupling between the cavity and the atom. An active stabilized system to control the cavity and the photon in the cavity must be established.Our goal is to build a set of frequency chain to control the micro-optical cavity effectively, including its resonance frequency, the detuning of the cavity and atom, and also the detuning of atom and photon. We have to solve some technical problems, such as the temperature drift of the transfer cavity and EOM impedance matching. This thesis will focus on how to build the system and how to solve these problems.The plotline of the thesis are as follows:The first chapter introduced cavity QED experiments and the background and frequency chain. There are two problems in the frequency chain system building process:temperature drift of the transfer cavity and EOM impedance matching. The second chapter first describes the principle of frequency chain, structure, component parameters; then uses a glass-ceramic material to make the cavity to solve the temperature drift of the transfer cavity; finally, made discussion of the the frequency chain system locking effect. The third chapter analyze and solve the EOM impedance mismatching;Based on the usual method,and by using the Smith Chart,we propose a set of reliable and rapid method of RF impedance matching for an EOM, which includes the analysis of a network construction,the design procedures by using Smith chart in LABVIEW environment.The results show that the impedance ironment.The results show that the impedance matching achieved high efficiencie.Finally, a summary of the full thesis.