Broadband parametric amplification with impedance engineering: Beyond the gain-bandwidth product

被引：113

作者：

Roy, Tanay ^{[1
]}

Kundu, Suman ^{[1
]}

Chand, Madhavi ^{[1
]}

Vadiraj, A. M. ^{[1
]}

Ranadive, A. ^{[1
]}

Nehra, N. ^{[1
]}

Patankar, Meghan P. ^{[1
]}

Aumentado, J. ^{[2
]}

Clerk, A. A. ^{[3
]}

Vijay, R. ^{[1
]}

机构：

[1] Tata Inst Fundamental Res, Dept Condensed Matter Phys & Mat Sci, Mumbai 400005, Maharashtra, India

[2] Natl Inst Stand & Technol, Boulder, CO 80305 USA

[3] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

来源：

APPLIED PHYSICS LETTERS | 2015年 / 107卷 / 26期

关键词：

QUANTUM; NOISE; BIT;

D O I：

10.1063/1.4939148

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present an impedance engineered Josephson parametric amplifier capable of providing bandwidth beyond the traditional gain-bandwidth product. We achieve this by introducing a positive linear slope in the imaginary component of the input impedance seen by the Josephson oscillator using a lambda/2 transformer. Our theoretical model predicts an extremely flat gain profile with a bandwidth enhancement proportional to the square root of amplitude gain. We experimentally demonstrate a nearly flat 20 dB gain over a 640MHz band, along with a mean 1-dB compression point of -110 dBm and near quantum-limited noise. The results are in a good agreement with our theoretical model. (C) 2015 AIP Publishing LLC.

引用

页数：5

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