作者
Mingrui Xu, Risheng Cheng, Yufeng Wu, Gangqiang Liu, Hong X Tang
发表日期
2023/2/1
期刊
PRX Quantum
卷号
4
期号
1
页码范围
010322
出版商
American Physical Society
简介
Superconducting parametric amplifiers are crucial components in microwave quantum circuits for enabling quantum-limited signal readout. The best-performing such amplifiers are often based on Josephson junctions, which however are sensitive to magnetic fields. Therefore, they require magnetic shields and are not easily integratable with other quantum systems that operate within magnetic fields, such as spin-ensemble quantum memories. To tackle this challenge, we develop a kinetic inductance-based parametric amplifier featuring a NbN nanobridge instead of Josephson junctions, which provides the desired nonlinearity for a strong parametric gain up to 42 dB. The added noise of this nanobridge kinetic-inductance parametric amplifier (hereby referred to as NKPA) is calibrated and found to be quanta for phase-preserving amplification, approaching the quantum limit of 0.5 quanta. Most importantly …
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