Ju n 20 21 Quantum harmonic oscillator spectrum analyzers

Jonas Keller, 2, 3 Pan-Yu Hou, 2 Katherine C. McCormick, 2, 4 Daniel C. Cole, Stephen D. Erickson, 2 Jenny J. Wu, 2 Andrew C. Wilson, and Dietrich Leibfried National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA Department of Physics, University of Colorado, Boulder, CO 80309, USA Present Address: Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany Present Address: Department of Physics, University of Washington, Seattle, WA 98195, USA (Dated: June 29, 2021)