Coherent control of spin 1/2 quantum systems using phases
利用相位的自旋1/2量子系统的相干控制

Model of a closed quantum system, which is composed of two spin 1/2 particles with interaction, is built. Specific quantum states are prepared by half-counterintuitive(HCI) pulses with fixed peak value and some selected relative phases. An approximate expression of the final state with relative phases as its parameter is derived from numerical system simulation experiments. The relation between the peak value, time delay of the two pulses and their effects to the preparation procedure are analyzed. Coherent control of quantum states with relative phases is achieved using partial adiabatic passage technology.