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There is a continuous search for solid-state spin qubits operating at roomtemperature with excitation in the IR communication bandwidth. Recently we haveintroduced the photoelectric detection of magnetic resonance (PDMR) to read theelectron spin state of nitrogen-vacancy (NV) center in diamond, a techniquewhich is promising for applications in quantum information technology. Bymeasuring photoionization spectra on a diamond crystal we found two ionizationthresholds that were not reported before. On the same sample we also observedabsorption and photoluminescence signatures that were identified in literatureas Ni associated defects. We performed \emph{ab initio} calculation of thephoto-ionization cross-section of the nickel split vacancy complex (NiV) andN-related defects in their relevant charge states and fitted the concentrationof these defects to the measured photocurrent spectrum, which led to asurprising match between experimental and calculated spectra. This studyenabled to identify the two unknown ionization thresholds with the two acceptorlevels of NiV. Because the excitation of NiV is in infrared, the photocurrentdetected from the paramagnetic NiV color centers is a promising way towardsdesigning a novel type of electrically readout qubits.

Identification of nickel-vacancy defect in the photocurrent spectrum of diamond by means of \emph{ab initio} calculations