Optimization Of A Linear Ion Trap Quantum Computation System And The Study Of A Pulsed Phonon Laser

Quantum computing, which is featured by the employment of quantum superposition and entanglement, as a counterpart of classical computing in the quantum world has been significantly developed over the past decades, because of the ability to speeding up the solv-ing of some difficult problems and simulating of quantum systems. Among the numerous systems for quantum computing, cold trapped ion system is considered to be one of the most promising candidates. That is because the ion trap provides a very clean and nearly isolated environment which promises a very long storage time and coherent manipulation time.In this thesis we focus on our efforts made on the setting up of a linear ion trap system for quantum computing, including the ion trap’s parameter measurement, optimization and estimate of the Doppler cooling limit under the condition of our laboratory, spectroscopic experiments on electrical quadrupole transition and the pulsed phonon laser, and so on.We optimized the trapping parameters of the linear trap, using the radio frequency (RF)-photon correlation method to detect and suppress the amplitude of excess micromotion in the radial directions. Linear trap imperfections was examined theoretically and experimen-tally with respect to the endcap electrode displacement and the RF induced voltage of DC electrode. The displacement of ions under different voltages was measured by EMCCD and was used to measure the geometrical factor of each electrode and to estimate the stray elec-tric field. According to the measured results, we estimated the possibility of entering the Lamb-Dicke region under the laboratory conditions, which lays a foundation for sideband cooling.According to the momentum coupling phenomenons found in our experiments, a pulsed phonon laser model was put forward and realized in the experiment based on higher order anharmonic potentials. The feasibility of Q-swtich pulsed phonon laser was also discussed in our trapped ion systems implementation.Magnetic field in our trap was controlled by three sets of home-made mutually orthogo-nal magnetic coil, by which the ambient stray magnetic field was nulled using Hanel Effect. Using ultra-narrow line width729nm laser, we obtained ten Zeeman spectral component of the4S1/2-3D5/2transition of40Ca+ion in the small magnetic field condition, which accom-plished technological accumulation of the computer timing control and laser pulse control. A background-free Doppler cooling with a linewidth suppressed high-power732nm laser on the4S1/2-3D3/2quadrupole transition was also carried out and preliminary results are obtained.