Quantum Optics in Diamonds

• We have investigated coloring centers that are promising for fluorescence thermometry of biological objects.
• Our researchers have studied correlations of of spectrums of photoluminescence of several coloring centers in diamonds: SiV-center, GeV-center and SnV-center that can be excited in the biological transparency window.
• It has been determined that location and width of the zero-phonon line of photoluminescence of the SnV-center change linearly in a wide range of temperatures which allow for utilization of such parameters as an independent check of temperature measurements.
• In the setting of growing high frequency monocrystals of CVD diamonds with low levels of nitrogen admixture in the reactor working at the 2.45 GHz frequency we have produced and tested a method for doping diamonds with silicon.
• We have determined optimal parameters of operation of a reactor for producing CVD diamonds with low content of defects and different content of SiV-centers. In this setting diamonds grow at the rate of 10 μm/hour.
• Our Laboratory has produced layers of a CVD diamonds with different content of SiV-centers depending on conditions of synthesis. For the best samples the width of the diamond peak in the Raman scattering range is 1.56–1.70 cm-1 which corresponds to diamonds with high crystalline perfection while width of the zero-phonon line of SiV-centers is 5 nm.
• We have implemented the effect of coherent trapping of populations in ensembles of NV-centers in diamonds in the context of anticrossing of levels of the ground state when a strong magnetic field is applied.
• We have proposed and tested a method for controlling angles between axes of a diamond with NV-centers and an external magnetic field. The method is based on cross-relaxation resonances.

Organizational and structural changes: The Laboratory has become the basis of the Quantum and Spin Technologies Center of the Kazan Research Center of the Russian Academy of Sciences

Collaborations:

• Texas A&M University (USA): joint research and publications
• King Abdulaziz City for Science and Technology (Saudi Arabia): joint research, experiments and publications
• Moscow State University (Russia): joint research and academic events