| As an essential part of the quantum information networks,the application of the quantum storage of the light field to quantum repeater,without any doubt,can greatly increase the range of quantum communication.In order to achieve quantum memory,it is important to realize the generation of non-classical light field which resonant with the medium.However,due to the impact of the decoherence and absorption loss in the storage mediums,it is hard for the reconstructed quantum state to remain pure but turns in a thermal state.In this paper,the introduction of the experimental preparation of 795 nm squeezed state field with the rubidium D1 absorption line and the discussion of the boundary in quantum storage of squeezed thermal state of light field will provide a theoretical reference for the future study on quantum storage in non-classical light field.The main researches in this thesis are as follows:1.795 nm squeezed state of light resonant to the D1 Rubidium line is obtained from an optical parametric amplifier pumped by a 398 nm laser.2.We theoretically analyze the storage process of squeezed thermal state light field through electromagnetically induced transparency process and numerical simulate the storage fidelity and fidelity benchmark between classical and quantum storage.3.We theoretically analyze the influence of different input state on the fidelity and fidelity boundary in quantum memory process and the relationship between the storage fidelity and the storage efficiency of different input states.The minimum storage efficiency to achieve quantum memory is also given for different input squeezed thermal states. |
