The magnetic field effect on the coherence time of qubit in RbCl crystal quantum pseudodot

In an external z-direction magnetic field, the coherence property of qubit in RbCl crystal quantum pseudodot (QPD) is discussed. The coherence time of QPD qubit is calculated by using the Pekar type variational method and the Fermi Golden Rule. It is analytically derived that the coherence time versus the cyclotron frequency of the magnetic field and the QPD parameters (the chemical potential of the two-dimensional electron gas, the zero point of pseudoharmonic potential, and the polaron radius) in QPD system. According to the results, it is found that the parameters and the magnetic field adjusts the coherence time of the qubit in the RbCl crystal QPD.