Radiatively-cooled quantum microwave amplifiers

• URL: http://arxiv.org/abs/2308.02106v1
• Date: Fri, 4 Aug 2023 02:01:40 GMT
• Title: Radiatively-cooled quantum microwave amplifiers
• Authors: Mingrui Xu, Yufeng Wu, Wei Dai, and Hong X. Tang
• Abstract summary: We demonstrate a quantum microwave amplifier that employs radiative cooling to operate at elevated temperatures. This work represents an important step for realizing scalable microwave quantum technologies.
• Score: 2.7694182767450455
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: Superconducting microwave amplifiers are essential for sensitive signal readout in superconducting quantum processors. Typically based on Josephson Junctions, these amplifiers require operation at milli-Kelvin temperatures to achieve quantum-limited performance. Here we demonstrate a quantum microwave amplifier that employs radiative cooling to operate at elevated temperatures. This kinetic-inductance-based parametric amplifier, patterned from a single layer of high-$T_\mathrm{c}$ NbN thin film\cmt{in the form of a nanobridge}, maintains a high gain and meanwhile enables low added noise of 1.3 quanta when operated at 1.5 Kelvin. Remarkably, this represents only a 0.2 quanta increase compared to the performance at a base temperature of 0.1 Kelvin. By uplifting the parametric amplifiers from the mixing chamber without compromising readout efficiency, this work represents an important step for realizing scalable microwave quantum technologies.

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