Kali prasanna NAYAK (Nayak Prasanna Kali)

Offer Organization: Japan Society for the Promotion of Science, System Name: Grants-in-Aid for Scientific Research, Category: Grant-in-Aid for Young Scientists (A), Fund Type: -, Overall Grant Amount: - (direct: 18600000, indirect: 5580000)
In this project, we have developed an optical tweezer based single atom trap on a photonic crystal (PhC) nanofiber cavity. Fabrication of high quality PhC cavities on nanofibers was demonstrated. The cavities were designed for efficient interfacing of trapped single atoms to nanofiber guided modes. The interference between the cavity modes leading to unique spectral features was investigated. Photo-thermal stabilization of the PhC nanofiber cavities under ultra-high vacuum conditions was achieved. It was demonstrated that single atoms can be successfully trapped on the nanofiber cavity and can be observed in real-time through the fiber guided modes. This enables deterministic preparation of single atom events for quantum photonics applications on an all-fiber platform.

Offer Organization: Japan Society for the Promotion of Science, System Name: Grants-in-Aid for Scientific Research, Category: Grant-in-Aid for Young Scientists (B), Fund Type: -, Overall Grant Amount: - (direct: 3400000, indirect: 1020000)
One of the key trends of modern quantum optics it to manipulate the quantum optical properties of atoms using various nano-waveguides. In this project, we investigated methods to improve the freedom of the manipulation using optical nanofibers as nano-waveguides. We developed a method to create cavity structure on an optical nanofiber using femto-laser interfered multi-photon fabrication method. Furthermore, we developed a method to create cavity structure on nanofiber by combining with an external nanostructure device (grating with central defect). Using this method, we demonstrated the spontaneous emission enhancement of a single atom (quantum dot) on a nanofiber.