Mitchell Institute for Fundamental Physics & Astronomy
College Station, Texas 77843
My group is developing several experimental directions, common motivation of which is quantum technologies – attempt to use unique properties of the quantum world do create some useful devices. There are few major streams in my research – color centers in atoms, quantum dots and cold atoms. In my talk I will only touch two of those, our work with color centers in diamond towards quantum computation and sensing and our work towards quantum simulations with cold atoms.
Color centers in diamond attract a lot of attention due to unique properties of diamond, such its optical and chemical purity, low concertation of nuclear spins in diamond matrix and its physical and chemical inertness. My group works with several color centers in diamond, but in this talk I will only focus on Germanium-vacancy (GeV) and Tin-vacancy (SnV) color centers. The key advantage of the group IV color centers in diamond is there relatively low sensitivity to the damages, created by nanofabrication. This opens unique opportunity to use this color centers with nanostructures photonic. In or work we are trying to make the next step in the development for such a device by integrating nanodiamonds, containing GeV color center with photonics devices out of more conventional for industry materials.
Another application of GeV color center developed by my group is temperature sensing. While the absolute record in combination of special resolution and sensitivity in measurement of magnetic fields and temperature belong to NV color centers in diamond, these measurements require use of microwave radiation of Watts level which somewhat limits its applications in bioscience. We found that GeV allow different, microwave-free alloptical way of temperature measurements which is already found some application in bio community.
In contract with color centers cold atom are more suitable for so-called quantum simulations. Specifically, thulium been lanthanide have a has as large orbital momentum and large magnetic momentum in the ground state. Large orbital momentum in ground state leads to easily tunable interactions between cold atoms via lowfield Fano-Feshbach resonances, while large magnetic moment leads to relatively strong dipole-dipole interactions. To perform quantum simulation one need first to create suitable initial state. In case of thulium atom, it means cooling thulium atom down to Bose-Einstein condensation temperature. We managed to cool thulium down Bose-Einstein condensation temperature using machine learning approach and studied its lowfield Fano-Feshbach resonances, thus opening the way for quantum simulation with thulium atom.