论文标题
一个三波混合动力电感旅行波放大器，并具有接近量子的噪声性能
A three-wave mixing kinetic inductance traveling-wave amplifier with near-quantum-limited noise performance
论文作者
论文摘要
我们提出了微波动感旅行波放大器（KIT）的理论模型和实验表征，其噪声性能通过射击噪声隧道连接（SNTJ）测量，接近量子限制。该套件偏向于直流电流，以三波混合方式运行，从而将微波炉泵张音的功率和相关的寄生虫加热与常规的四波混合套件设备相比，降低了几个数量级。它由50欧姆的人造传输线组成，其色散允许受控的放大带宽。我们估计$ 16.5^{+1} _ { - 1.3} $ db在2 GHz带宽中，输入1 dB压缩功率为-63 dbm，与理论定性一致。使用一个理论框架来说明SNTJ生成的噪声，同时进入套件的信号和惰轮端口，我们测量了将套件集成为第一个放大器的放大链的系统添加噪声。在3.5和5.5 GHz之间，此系统增添的噪声，$ 3.1 \ pm0.6 $ Quanta（相当于$ 0.66 \ pm0.15 $ k），是替换该链中SNTJ的设备可以看到的设备。因此，该套件适合读取大量的微波动力电感探测器，并有望用于多路复用超导量子量读数。
We present a theoretical model and experimental characterization of a microwave kinetic inductance traveling-wave amplifier (KIT), whose noise performance, measured by a shot-noise tunnel junction (SNTJ), approaches the quantum limit. Biased with a dc current, the KIT operates in a three-wave mixing fashion, thereby reducing by several orders of magnitude the power of the microwave pump tone and associated parasitic heating compared to conventional four-wave mixing KIT devices. It consists of a 50 Ohms artificial transmission line whose dispersion allows for a controlled amplification bandwidth. We measure $16.5^{+1}_{-1.3}$ dB of gain across a 2 GHz bandwidth with an input 1 dB compression power of -63 dBm, in qualitative agreement with theory. Using a theoretical framework that accounts for the SNTJ-generated noise entering both the signal and idler ports of the KIT, we measure the system-added noise of an amplification chain that integrates the KIT as the first amplifier. This system-added noise, $3.1\pm0.6$ quanta (equivalent to $0.66\pm0.15$ K) between 3.5 and 5.5 GHz, is the one that a device replacing the SNTJ in that chain would see. This KIT is therefore suitable to read large arrays of microwave kinetic inductance detectors and promising for multiplexed superconducting qubit readout.
