Broadband Continuous-Variable Entanglement Generation Using a Kerr-Free Josephson Metamaterial

Abstract

Generation of quantum resources like entanglement is pivotal for quantum technology. This work uses superconducting Josephson metamaterials to generate color-entangled photons from vacuum fluctuations at a high rate, showing the presented system to be a superb microwave entanglement generator with remarkable bandwidth. Successful squeezing of the light is also demonstrated. These results are quite promising for quantum computing, sensing, and communication with superconducting devices.