Temporally Asymmetric Biphoton States in Cavity-Enhanced Optical Parametric Processes
Usman A. Javid, Steven D. Rogers, Austin Graf, Qiang Lin · Physical Review Applied · 2019
Generation of photons in controlled temporal modes is a key part of connecting distant nodes of a quantum network built with atomic and cavity systems. For efficient coupling, such systems require narrowband photons with specific spectral and temporal wavefunctions. To date, this has only been possible in bulk optical setups, and mostly for broadband light. Here researchers present a chip-scale technique based on controlling the density of states of a silicon whispering-gallery-mode resonator, using Rayleigh scattering. The cavity generates entangled photons of sub-GHz bandwidth with four-wave mixing, in temporal modes that can be controlled via the scattering process.