Abstract:

The quantum control of the time varying magnetic field on the electron spin is studied by means of

the method for the quantum control of the electron spin in a constant magnetic field，namely，the time varying magnetic

field is converted to a rotating magnetic field and a constant magnetic field. Using the precession frequency of

the rotating magnetic field and the adjustment of magnitude and action time of the magnetic field，it can make the

spin direction of the particle cause periodic change occurred between the +z and -z directions and adjust the size of

amplitude of the static magnetic field and the time of action to control the spin of the electron. This achieves the

　　control of the direction of electron spin.

Key words: quantum state, time-varying magnetic field, spin of electron, quantum control