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We report here on a major improvement of the control and characterizationcapabilities of 14N nuclear spin of single NV centers in diamond, as well as ona new method that we have devised for characterizing quantum states, i.e.quantum state tomography using Rabi experiments. Depending on whether we useamplitude information or phase information from Rabi experiments, we define twosub-methods namely Rabi amplitude quantum state tomography (RAQST) and Rabiphase quantum state tomography (RPQST). The advantage of Rabi-based tomographymethods is that they lift the requirement of unitary operations used in othermethods in general and standard methods in particular. On one hand, this doesnot increase the complexity of the tomography experiments in large registers,and on the other hand, it decreases the error induced by MW irradiation. Weused RAQST and RPQST to investigate the quality of various two-qubit purestates in our setup. As expected, test quantum states show very high fidelitywith the theoretical counterpart.

High fidelity two-qubit quantum state tomography of Electron-14N hybrid spin register in diamond