HQOC/ITAMP Joint Quantum Sciences Seminar Wednesday, November 2, 2016 4:00 PM, Jefferson 250 Prof. Mete Atature, University of Cambridge "Solid-State Spin-Photon Interfaces: Old Friends & New" Optically active spins confined in solids, such as semiconductors or diamond, are interesting and rich physical systems for quantum science and its applications. Their inherently mesoscopic nature leads to a multitude of dynamics within the solid state environment of spins, charges, vibrations and light. While the quantum optics provides a toolbox for advanced spectroscopic investigations for these interaction mechanisms, it also offers solution possibilities for their detrimental effects for the realisation of operational quantum devices. Implementing a high level of control on these constituents and their interactions with each other creates exciting opportunities for realizing stationary and flying qubits within the context of spin-based quantum information science. In this talk, I will provide a snapshot of the progress and challenges for interconnected solid-state spins, as well as first steps towards hybrid quantum devices involving emergent materials. Mihir Bhaskar, Lukin Group "Quantum Nonlinear Optics with a Germanium-Vacancy Color-Center in a Diamond Waveguide" Quantum networks require scalable architectures that enable efficient interactions between single-photons and atom-like emitters. We demonstrate a solid-state platform interfacing Germanium-Vacancy (GeV) color-centers in diamond with fiber-coupled waveguides. We infer a high radiative quantum efficiency of GeV optical transitions for temperatures up to 450 K and demonstrate a single-photon detection rate of 0.56 Mcps in a single-mode fiber on the narrowband zero-phonon line transition. GeV centers maintain their optical coherence inside nanophotonic structures as verified by nearly lifetime-broadened transition linewidths and optical Rabi oscillations at T = 5 K. These properties result in a high-cooperativity interface between waveguide photons and a single GeV without the use of a slow-light waveguide or cavity. A single GeV reduces waveguide transmission by 18 +- 1%, corresponding to a cooperativity of C = 0.10 +- 0.01. We demonstrate that the GeV-waveguide system is nonlinear at the single-photon level by probing the photon statistics of the device output field. This work paves the way towards deterministic spin-photon interfaces based on diamond color-centers in slow-light waveguides and cavities. 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