Double Resonance Of Cavity For 9.2 GHz Frequency Difference And Intracavity Atomic Coherence

Achievement of strong coherent interactions between photons and atoms can be applied in many fields, such as quantum communication, the research of strong correlated many-body quantum systems. Recent studies have shown that electromagnetically induced transparency (EIT) effects make the establishment of a certain time quantum entanglement between the radiation field of quantum states and the inverted spin quantum states of atomic. It provides the best way for the transfer between the light and the physical particle quantum state. EIT medium is effective node in quantum state storage and transfer. The optical resonator can increase the effective optical thickness of atoms, and enhance coherent interactions of cavity mode and the atoms. Therefore, one way to enhance the strong coupling between the field and the atom is the atom is placed in the optical resonator. This paper studies the dual resonant optical cavity corresponding to the three-level system of cesium atoms. And the cavity can be used to study quantum coherence effects and characteristics.This paper analyzes the source of amplitude noise, find that the quantum noise between probe field and coupling field can be transformed into each other. In order to improve the conversion efficiency of quantum states, focusing on the experimental demonstration of intracavity double resonance for 9.2 GHz frequency difference lights and intracavity atomic coherence effects. Mainly consists of the following three parts:The first part describes the basics of the coherent process between light and atoms and the optical resonator.The second part analyzes the source of amplitude noise, noting that the phase noise of the light field can be converted to the amplitude noise and affected by media, such as the absorption and dispersion. Our experiment demonstrates the phase noise can converted to amplitude noise in probe field, and the conversion between the probe field and the pump field about the classical or quantum signal. To achieve the high fidelity of quantum storage provides some basis.The third section, in order to improve the conversion efficiency of quantum states, our paper designs and implements the lock and spatial separation of two lights with 9.2 GHz frequency difference in a ring cavity and M-Z interferometer. The accurate length of cavity is used to accomplish double resonance for the two lights. And then, the two beams are spatial separated with an unbalanced M-Z interferometer. The device has laid an experimental foundation for the realization of the optical quantum exchange with a coherent atomic medium in an optical cavity.