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The coherent dynamics and control of spin qubits are essential requirementsfor quantum technology. A prominent challenge for coherent control of a spinqubit in a set of qubits is the destructive effect of the applied magneticfield on the coherent dynamics of neighbouring qubits due to its spatialextension. We propose a novel scheme to characterize the coherent dynamics ofthese quantum systems and to coherently control them using a magnetic field.Our scheme consists of a resonator that encompasses the desired quantum systemand a modulated electron beam that passes through the resonator in closeproximity to the quantum system of interest. The dynamics of the system isobtained by solving the Lindblad master equation. To verify the reliability ofour model, we tested the model on a Potassium atom, $^{41}$K and NV$^-$ centrein Diamond. The results show that by properly controlling the parameters of theresonator and the electron beam, the coherence and decoherence rates of thesequantum systems can be improved. Our model has the potential to be used forcharacterizing different types of spin-based quantum systems, and implementingquantum logic gates for quantum computation.

Characterization and Coherent Control of Spin Qubits with Modulated Electron Beam and Resonator