Broadband Continuous-Variable Entanglement Generation Using a Kerr-Free Josephson Metamaterial
Michael Perelshtein, Kirill Viktorovich Petrovnin, Visa Vesterinen, Sina Hamedani Raja, Ilari Lilja, Michael Will, Alexander M. Savin, Slawomir Simbierowicz, Robab Najafi Jabdaraghi, Janne Samuel Lehtinen, Leif Grönberg, Juha Hassel, Mika Prunnila, Joonas Govenius, Gheorghe Sorin Paraoanu, Pertti Hakonen · Physical Review Applied · 2022
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.