极化约瑟夫森行波参量放大器中的准相位匹配
Quasi-phasematching in a poled Josephson traveling-wave parametric amplifier with three-wave mixing
摘要：
我们发展了准相位匹配（QPM）的概念，并将其应用于最近提出的具有三波混频（3WM）的约瑟夫森行波参量放大器（JTWPA）中。该放大器是基于一个梯形传输线组成的磁通偏置的射频SQUID的非线性是$χ^{(2)}$型。QPM是在3WM工艺中实现的，$ω_p=ω_s+ω_i$（其中$ω_p$、$ω_s$和$ω_i$分别是泵浦、信号和空闲频率），这是由于将JTWPA设计成包括这些SQUID的周期性反转组，这些SQUID反转非线性的符号。建模表明，JTWPA带宽相对较大（约为2.5 GHz）。$0.4ω_p$）和平坦模式，而不需要的模式，包括$ω_{2p}=2ω_p$、$ω_+=ω_p +ω_s$、$ω_- = 2ω_p - ω_s$等，在工程分散的帮助下被强烈抑制。
英文摘要：
We develop the concept of quasi-phasematching (QPM) by implementing it in the recently proposed Josephson traveling-wave parametric amplifier (JTWPA) with three-wave mixing (3WM). The amplifier is based on a ladder transmission line consisting of flux-biased radio-frequency SQUIDs whose nonlinearity is of $χ^{(2)}$-type. QPM is achieved in the 3WM process, $ω_p=ω_s+ω_i$ (where $ω_p$, $ω_s$, and $ω_i$ are the pump, signal, and idler frequencies, respectively) due to designing the JTWPA to include periodically inverted groups of these SQUIDs that reverse the sign of the nonlinearity. Modeling shows that the JTWPA bandwidth is relatively large (ca. $0.4ω_p$) and flat, while unwanted modes, including $ω_{2p}=2ω_p$, $ω_+=ω_p +ω_s$, $ω_- = 2ω_p - ω_s$, etc., are strongly suppressed with the help of engineered dispersion.
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