Josephson junction microwave amplifier in self-organized noise compression mode.

Josephson junction microwave amplifier in self-organized noise compression mode.
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DOI:
10.1038/srep00276
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发表时间:
2012
期刊:
影响因子:
4.6
通讯作者:
Hakonen, Pertti
Hakonen, Pertti
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Lahteenmaki, Pasi;Vesterinen, Visa;Hassel, Juha;Seppa, Heikki;Hakonen, Pertti

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保相放大器在频率上的基本噪声极限是标准量子极限。在微波范围内,最好的候选者是基于超导量子干涉器件的放大器(在700 MHz达到噪声温度)和非简并参量放大器(在8 GHz达到接近量子极限的噪声水平)。  本文介绍了一种基于选择性阻尼约瑟夫森结负阻特性的新型放大器。我们的放大器的噪声性能受到从约瑟夫森振荡区到信号频率的量子噪声的混合的限制。由于工作点的自组织,测量结果在2.8 GHz时几乎达到量子极限操作。模拟描述了我们的设备的特点,以及表明宽带操作的潜力。
The fundamental noise limit of a phase-preserving amplifier at frequency is the standard quantum limit . In the microwave range, the best candidates have been amplifiers based on superconducting quantum interference devices (reaching the noise temperature at 700 MHz), and non-degenerate parametric amplifiers (reaching noise levels close to the quantum limit at 8 GHz). We introduce a new type of an amplifier based on the negative resistance of a selectively damped Josephson junction. Noise performance of our amplifier is limited by mixing of quantum noise from Josephson oscillation regime down to the signal frequency. Measurements yield nearly quantum-limited operation, at 2.8 GHz, owing to self-organization of the working point. Simulations describe the characteristics of our device well and indicate potential for wide bandwidth operation.
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