Strong environmental coupling in a Josephson parametric amplifier

被引：150

作者：

Mutus, J. Y. ^{[1
]}

White, T. C. ^{[1
]}

Barends, R. ^{[1
]}

Chen, Yu ^{[1
]}

Chen, Z. ^{[1
]}

Chiaro, B. ^{[1
]}

Dunsworth, A. ^{[1
]}

Jeffrey, E. ^{[1
]}

Kelly, J. ^{[1
]}

Megrant, A. ^{[1
,2
]}

Neill, C. ^{[1
]}

O'Malley, P. J. J. ^{[1
]}

Roushan, P. ^{[1
]}

Sank, D. ^{[1
]}

Vainsencher, A. ^{[1
]}

Wenner, J. ^{[1
]}

Sundqvist, K. M. ^{[3
]}

Cleland, A. N. ^{[1
]}

Martinis, John M. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[3] Texas A&M Univ, Dept Elect & Comp Engn, College Stn, TX 77843 USA

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 26期

关键词：

QUANTUM; NOISE;

D O I：

10.1063/1.4886408

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present a lumped-element Josephson parametric amplifier designed to operate with strong coupling to the environment. In this regime, we observe broadband frequency dependent amplification with multi-peaked gain profiles. We account for this behavior using the "pumpistor" model which allows for frequency dependent variation of the external impedance. Using this understanding, we demonstrate control over the complexity of gain profiles through added variation in the environment impedance at a given frequency. With strong coupling to a suitable external impedance, we observe a significant increase in dynamic range, and large amplification bandwidth up to 700 MHz giving near quantum-limited performance. (C) 2014 AIP Publishing LLC.

引用

页数：4

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