High-Rate Photon Pairs and Sequential Time-Bin Entanglement with Si$_3$N$_4$ Ring Microresonators

Understand

Integrated photonics is increasing in importance for compact, robust, and scalable enabling quantum technologies.

• This is particularly interesting for developing quantum communication networks, where resources need to be deployed in the field.
• We exploit photonic chip-based $ \rm Si_3 N_4$ ring microresonators for the generation of photon pairs with low-loss, high-noise suppression and coincidence rates of $80\times 10^3\,$s$^{-1}$.
• A simple photonic noise characterisation technique is presented that distinguishes linear and nonlinear contributions that is useful for system design and optimisation.