Reflective amplification without population inversion from a strongly driven superconducting qubit

Amplification of optical or microwave 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, an artificial atom, to the field in a semi-infinite wavegui...

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Bibliographic Details
Published in:arXiv.org 2017-07
Main Authors: Wen, P Y, Kockum, A F, Ian, H, Chen, J C, Nori, F, I -C Hoi
Format: Article
Language:English
Subjects:
Amplification
Computer simulation
Data processing
Population inversion
Quantum dots
Quantum phenomena
Quantum theory
Qubits (quantum computing)
Stimulated emission
Superconductivity
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Summary:Amplification of optical or microwave 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, an artificial atom, to the field in a semi-infinite waveguide. When driving the qubit strongly on resonance such that a Mollow triplet appears, we observe a 7\% amplitude gain for a weak probe at frequencies in-between the triplet. This amplification is not due to population inversion, neither in the bare qubit basis nor in the dressed-state basis, 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. The device demonstrated here may have applications in quantum information processing and quantum-limited measurements.
ISSN:2331-8422
DOI:10.48550/arxiv.1707.06400