Simon Gröblacher,1, 2, ∗ Jeff T. Hill,1, 2, ∗ Amir H. Safavi-Naeini,1, 2, ∗ Jasper Chan,1 and Oskar Painter1, 2, 3, † 1Thomas J. Watson, Sr., Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA 91125 2Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125 3Max Planck Institute for the Science of Light, Günther-Scharowsky-...