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