工作在频率转换模式下的近量子极限亚GHz TiN动能电感行波参量放大器
A Near Quantum Limited Sub-GHz TiN Kinetic Inductance Traveling Wave Parametric Amplifier Operating in a Frequency Translating Mode
AI总结：
本研究设计并表征了基于TiN蜿蜒微带线的亚GHz动能电感行波参量放大器，工作于频率转换模式，在450-850MHz范围实现最高22dB增益，泵浦功率较NbTiN方案低一个数量级，可用于多领域高灵敏测量。
摘要：
我们提出了一种适用于亚GHz频率的动能电感行波参量放大器（KI-TWPA）的设计与实验表征。KI-TWPA借助超导传输线的非线性动能电感所支持的非线性混频过程实现信号放大。本文所述器件采用紧凑蜿蜒结构的TiN微带传输线，以达到放大亚GHz信号所需的长度。该器件工作在频率转换模式下：放大后的信号音在放大器输出端被终止，而约2.5 GHz的闲频音被引出低温恒温器。通过改变泵浦频率，在约450至850 MHz的可调范围内实现了最高22 dB的增益。与此前KI-TWPA实现方案中使用的NbTiN相比，采用TiN作为非线性元件可将所需泵浦功率降低约一个数量级。该放大器有望在量子计算、天体物理学和暗物质探测等广泛应用中实现高灵敏度和高速测量。
英文摘要：
We present the design and experimental characterization of a kinetic-inductance traveling-wave parametric amplifier (KI-TWPA) for sub-GHz frequencies. KI-TWPAs amplify signals through nonlinear mixing processes supported by the nonlinear kinetic inductance of a superconducting transmission line. The device described here utilizes a compactly meandered TiN microstrip transmission line to achieve the length needed to amplify sub-GHz signals. It is operated in a frequency translating mode where the amplified signal tone is terminated at the output of the amplifier, and the idler tone at approximately 2.5~GHz is brought out of the cryostat. By varying the pump frequency, a gain of up to 22 dB was achieved in a tunable range from about 450 to 850~MHz. Use of TiN as the nonlinear element allows for a reduction of the required pump power by roughly an order of magnitude relative to NbTiN, which has been used for previous KI-TWPA implementations. This amplifier has the potential to enable high-sensitivity and high-speed measurements in a wide range of applications, such as quantum computing, astrophysics, and dark matter detection.
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