HQOC/ITAMP Joint Quantum Sciences Seminar Wednesday, September 21, 2016 4:00 PM, Jefferson 250 Prof. Jelena Vuckovic, Stanford "Quantum nanophotonics" Nanophotonic structures that localize photons in sub-wavelength volumes are possible today thanks to modern nanofabrication and optical design techniques. Such structures enable studies of new regimes of light-matter interaction, quantum and nonlinear optics, and new applications in computing, communications, and sensing. I will review our recent work on the traditional quantum nanophotonics platform based on InAs quantum dots inside GaAs photonic crystal cavities [1-3], as well as our progress on alternative material systems diamond and silicon carbide [4], which could potentially bring the described experiments to room temperature and facilitate scaling to large networks of resonators and emitters. Finally, the use of inverse design nanophotonic methods [5], that can efficiently perform physics-guided search through the full parameter space, leads optical devices with properties superior to state of the art, including smaller footprints, better field localization, and novel functionalities. [1] Optica, vol. 3, 931-936 (2016) [2] Nature Photonics,vol. 10, pp. 163-166 (2016) [3] Physical Review Letters, vol. 114, 233601 (2015) [4] Nano Letters, vol. 16 (1), pp. 212-217 (2016) [5] Nature Photonics 9, 374-377 (2015) Srujan Meesala, Loncar Group "Strain engineering of silicon vacancy centers in diamond MEMS cantilevers" The silicon vacancy (SiV) center in diamond has recently attracted attention as a solid state quantum emitter due to its attractive optical properties. We fabricate diamond MEMS cantilevers, and use electrostatic actuation to apply controlled strain fields to single SiV centers implanted in these devices. The strain response of the SiV electronic levels is measured - we demonstrate over 100 GHz tuning for the mean optical transition frequency, and over 400 GHz tuning for the orbital splitting within the ground state. The interaction Hamiltonian for strain fields is inferred, and large strain susceptibilities of the order 1 PHz/strain are measured. We discuss prospects to utilize our device to reduce phonon-induced decoherence in SiV spin qubits, and to exploit the large strain susceptibility for hybrid quantum systems based on nanomechanical resonators. Student Presentation from 4:00-4:10 PM Refreshments Served from 4:10-4:30 PM Guest Presentation from 4:30-6:00 PM -- Clare Ploucha Faculty Assistant to Professors Lukin & Greiner and their labs Department of Physics 17 Oxford St., Lyman 324A Cambridge, MA 02138 P. (617) 496-2544