Amplification without Population Inversion from a Strongly Driven Superconducting Qubit

ORAL

Abstract

Amplification of EM fields is often achieved by strongly driving a medium to induce population inversion such that a weak probe can be amplified through stimulated emission. Here we strongly couple a superconducting qubit to the field in a semi-infinite waveguide. When driving the qubit strongly on resonance such that a Mollow profile appears, we observe a few percent amplitude gain for a weak probe at frequencies in between the Mollow profile. This amplification is not due to population inversion, but instead results from a four-photon process that converts energy from the strong drive to the weak probe. We find excellent agreement between the experimental results and numerical simulations without any free fitting parameters.

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Presenters

  • IO CHUN HOI

    Department of Physics, National Tsing Hua University, Taiwan

Authors

  • Ping Yi Wen

    Department of Physics, National Tsing Hua University, Taiwan, Department of Physics, National Tsing Hua University

  • Anton Frisk Kockum

    Department of Microtechnology and Nanoscience, Chalmers University of Technology, Sweden, Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Chalmers University of Technology

  • Hou Ian

    Institute of Applied Physics and Materials Engineering, University of Macau, Macau, Institute of Applied Physics and Materials Eng., University of Macau

  • Jeng-Chung Chen

    Department of Physics, National Tsing Hua University, Taiwan, Center for Quantum Technology, National Tsing Hua University, National Tsing Hua University

  • Franco Nori

    RIKEN/University of Michigan, Center for Emergent Matter Science, RIKEN, Japan, Physics Department, The University of Michigan, RIKEN

  • IO CHUN HOI

    Department of Physics, National Tsing Hua University, Taiwan