Crafting high-dimensional tools for photonic quantum networks with tailored nonlinear optics
John Donohue, Institute for Quantum Computing
The time-frequency degree of freedom of light offers an intrinsically high-dimensional encoding space which is naturally compatible with waveguide devices and fiber infrastructure. However, coherent manipulation and measurement the information-carrying modes presents a challenge due to the sub-picosecond timescales inherent to downconversion-based photon sources. In this talk, I will discuss methods based on ultrafast pulse shaping and sum-frequency generation to address these temporal modes.The key behind these techniques is group-velocity engineering in nonlinear waveguides, which can be used to create mode-selective upconversion devices and well as photon sources with programmable time-frequency features. We will show applications of these techniques for single-photon time-frequency reconstruction, quantum-limited time-frequency estimation, and remote state preparation. This work was undertaken at Paderborn University in the Integrated Quantum Optics group of Christine Silberhorn. arXiv:1803.04316.
If you are coming from the Laziridis Centre, take the 11:35am shuttle to RAC 1 and return on the 1:15pm shuttle. There will be a light lunch served.