Low-noise kinetic inductance traveling-wave amplifier using three-wave mixing.
Low-noise kinetic inductance traveling-wave amplifier using three-wave mixing.
复制标题
采用三波混频的低噪声动感电感行波放大器。
作者：
M. Vissers;R. Erickson;H. Ku;L. Vale;Xian Wu;G. Hilton;D. Pappas
我们研制了一种基于超导动力学电感行波器件的宽带宽、高动态范围、低噪声低温放大器。该器件由NbTiN制成，由硅芯片上的长共面波导组成。通过添加DC电流和RF泵浦音调，我们能够使用三波混频产生参量放大。该器件在4至8 GHz的瞬时带宽内表现出超过15 dB的增益。总可用增益带宽（包括信号空载增益区域两侧）大于6 GHz。与器件的输入有关的噪声接近量子极限，具有小于1个光子的过量噪声。与类似结构的四波混频放大器相比，这些器件在RF泵浦下工作时的功率低约20 dB，频率远离信号。这将允许更容易地集成到大规模量子位和检测器应用中。
We have fabricated a wide-bandwidth, high dynamic range, low-noise cryogenic amplifier based on a superconducting kinetic inductance traveling-wave device. The device was made from NbTiN and consisted of a long, coplanar waveguide on a silicon chip. By adding a DC current and an RF pump tone we are able to generate parametric amplification using three-wave mixing. The devices exhibit gain of more than 15 dB across an instantaneous bandwidth from 4 to 8 GHz. The total usable gain bandwidth, including both sides of the signal-idler gain region, is more than 6 GHz. The noise referred to the input of the devices approaches the quantum limit, with less than 1 photon excess noise. Compared to similarly constructed four-wave mixing amplifiers, these devices operate with the RF pump at ~20 dB lower power and at frequencies far from the signal. This will permit easier integration into large scale qubit and detector applications.