EurekAlert  May 1, 2020 Researchers at MIT show that relatively simple integrated photonic circuits have the potential to realize a high fidelity deterministic controlled-phase gate between photonic qubits using bulk optical nonlinearities. The gate is enabled by converting travelling continuous-mode photons into stationary cavity modes using strong classical control fields that dynamically change the effective cavity-waveguide coupling rate. This architecture reduces the wave packet distortions that otherwise accompany the action of optical nonlinearities. They show that dynamically coupled cavities enable a trade-off between errors due to loss and wave packet distortion. The proposed architecture represents a new approach only relies […]