Parametric amplification and squeezing with an ac- and dc-voltage biased superconducting junction
Parametric amplification and squeezing with an ac- and dc-voltage biased superconducting junction
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DOI：
10.1103/physrevapplied.11.034035
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发表时间：
2019-03-14
影响因子：
4.6
通讯作者：
Altimiras, Carles
中科院分区：
文献类型：
--
作者：
Mendes, Udson C.;Jezouin, Sebastien;Altimiras, Carles
基于准粒子流经超导体-绝缘体-超导体结的非线性动力学，我们从理论上研究了一种近量子极限参量放大器。光子辅助隧穿，导致从直流和交流电压偏置的组合，引起了强烈的参数相互作用的电磁模式所反映的结耦合到传输线。我们显示相敏和相位保持放大，以及单模和双模压缩。对于以两倍中心频率（ω（0）/2 π = 6 GHz）泵浦的铝结，我们预测微波信号的窄带相敏放大超过20 dB，并且在1.2 GHz的3 dB带宽上的宽带保相放大为20 dB。我们还预测单模和双模压缩在5.3 GHz的3 dB带宽上达到超过-12 dB。此外，与一个简单的阻抗匹配电路，我们证明了3 dB带宽达到4.3 GHz的20 dB的增益。该器件的一个关键特性是其性能可以通过施加的直流和交流偏置电压进行原位控制。
We theoretically investigate a near-quantum-limited parametric amplifier based on the nonlinear dynamics of quasiparticles flowing through a superconductor-insulator-superconductor junction. Photon-assisted tunneling, resulting from the combination of dc- and ac-voltage bias, gives rise to a strong parametric interaction for the electromagnetic modes reflected by the junction coupled to a transmission line. We show phase-sensitive and phase-preserving amplification, together with single- and two-mode squeezing. For an aluminum junction pumped at twice the center frequency, omega(0)/2 pi = 6 GHz, we predict narrow-band phase-sensitive amplification of microwaves signals to more than 20 dB, and broadband phase-preserving amplification of 20 dB over a 3-dB bandwidth of 1.2 GHz. We also predict single- and two-mode squeezing reaching more than -12 dB over a 3-dB bandwidth of 5.3-GHz. Moreover, with a simple impedance-matching circuit, we demonstrate a 3-dB bandwidth reaching 4.3 GHz for 20 dB of gain. A key feature of the device is that its performance can be controlled in situ with the applied dc- and ac-voltage biases.