Direct-current-powered microwave amplifiers that approach the quantum noise limit can be created through the control of emission processes in a superconducting circuit.
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Bergeal, N. Microwave amplifiers keep the noise down. Nat Electron 1, 210–211 (2018). https://doi.org/10.1038/s41928-018-0062-8
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DOI: https://doi.org/10.1038/s41928-018-0062-8
