约瑟夫森光子学器件的相位稳定电压偏置
Phase-stable voltage bias for Josephson photonics devices
- Institut Quantique, Université de Sherbrooke（量子研究所，雪布鲁克大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究通过集成约瑟夫森电压标准为直流偏置的约瑟夫森光子学器件建立抗噪相位参考，实现低相位噪声架构，使平均增益提升14分贝，并首次观察到相位敏感增益和压缩，为超导电路高纯度参量过程提供稳健平台。
AI中文摘要：
参量相互作用是超导量子技术的基础，然而传统的微波驱动泵浦会引入寄生的克尔非线性和高阶谐波，从而限制器件性能。约瑟夫森光子学（JP）通过利用直流偏置结来避免这些寄生效应，但一直受限于高相位噪声和缺乏稳定的相位参考。在此，我们通过集成约瑟夫森电压标准（JVS）来建立抗噪的相位参考，克服了这一限制，并证明该参考通过超导序参量相干地传递到非弹性库珀对隧穿放大器（ICTA）。由此产生的低相位噪声架构使平均增益提高了14分贝，并具有更好的量子极限噪声性能。关键的是，该相位参考使得在直流偏置放大器中首次观察到相位敏感增益和压缩。通过将干净、无克尔的非线性与相位相干驱动相协调，我们的架构为超导电路中的高纯度参量过程建立了一个稳健的平台。
英文摘要：
Parametric interactions are foundational to superconducting quantum technologies, yet conventional microwave-driven pumping introduces parasitic Kerr nonlinearities and higher-order harmonics that limit device performance. Josephson Photonics (JP) avoids these parasitics by utilizing dc-biased junctions but has remained constrained by high phase noise and the absence of a stable phase reference. Here, we overcome this limitation by integrating a Josephson voltage standard (JVS) to establish a noise-tolerant phase reference, and demonstrate that this reference is coherently transferred to an inelastic Cooper-pair tunneling amplifier (ICTA) via the superconducting order parameter. The resulting low-phase-noise architecture yields a 14-dB enhancement in averaged gain and better quantum-limited noise performance. Critically, the phase reference enables the first observation of phase-sensitive gain and squeezing in a dc-biased amplifier. By reconciling clean, Kerr-free nonlinearities with phase-coherent drive, our architecture establishes a robust platform for high-purity parametric processes in superconducting circuits.
