The Generation And Application Of Non-Classical Frequency Combs

Non-classical light source is very important in quantum information science. It is an essential resource in quantum network construction, quantum communication, quantum computation, quantum metrology and quantum imaging. Multimode quantum states of light not only plays a significant role in quantum key distribution, but also is promising to broaden the capacity of quantum communication. Therefore, how to generate compact and useful multimode quantum light resource is the hotpot in quantum physics research. It is known to all that femtosecond mode-locked laser is a special coherent light source---frequency combs, that means each light pulse has large numbers of frequency modes, and interfacing modes has same frequency interval. The feature mentioned above suggests that the femtosecond mode-locked laser is a nice light source to generate multipart non-classical light. Moreover, femtosecond laser has very a small temporal span and super high peak power density. It is also hopeful to be utilized in quantum metrology and quantum imaging. In recent years, the non-classical frequency combs have already successfully generated in lab which is promising to be used in measurement of time with high precision.Our main works are around the generation and application of non-classical frequency combs. The key parts of the thesis are arranged as follow:(1) Experimental generation of quantum frequency combs. We use synchronously pumped optical parametric oscillator and optical nonlinear effects to amplify or reduce the signal light. In which process, we achieve the quantum frequency combs. With the help of self-homodyne detector and balanced homodyne detector, we get2.2dB amplitude squeezed pulsed light and more than2.6dB phase squeezed frequency combs.(2) Theoretically analyzing the influence of phase fluctuations on the time measurement based on homodyne detection. We use balanced homodyne detector and non-classical light to beat the standard quantum limit in time measurement. This modal of time transferring is first put forward by Lamine in2008. However, when considering the real parameter and condition of the experiment, the long path of the time transferring may bring disturbance to relative phase between signal light and local light. We estimate the possible effect of the phase fluctuations in the time measuring result.