Army researchers see path to quantum computing at room temperature

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 on components that have been individually demonstrated. They expect that it will take about ten years for the necessary improvements to realize this architecture…read more. TECHNICAL ARTICLE