近量子限约瑟夫森结频率梳状合成器
Nearly quantum-limited Josephson-junction Frequency Comb synthesizer
摘要：
虽然相干驱动的克尔微腔作为频率梳形成的平台已经迅速成熟，但这种微谐振器通常具有弱克尔系数;因此，触发梳产生需要数百万光子在腔内循环。这就抑制了量子涨落在梳的动力学中的作用。在本文中，我们实现了一个最小版本的相干驱动克尔介导的微波频率梳的电路QED架构，量子真空的波动是梳相干性的主要限制。我们获得了高达35~ $μ$ s的梳状相位相干性，接近理论器件量子极限55~ $μ$ s，并且大大长于模式的固有寿命13~ns。在cQED中设计比光学微谐振器更强的非线性的能力，以及在低温下的操作，以及梳状动力学与量子理论的良好一致性，指示了用于研究量子非线性系统的复杂动力学的有希望的平台
英文摘要：
While coherently-driven Kerr microcavities have rapidly matured as a platform for frequency comb formation, such microresonators generally possess weak Kerr coefficients; consequently, triggering comb generation requires millions of photons to be circulating inside the cavity. This suppresses the role of quantum fluctuations in the comb's dynamics. In this paper, we realize a minimal version of coherently-driven Kerr-mediated microwave frequency combs in the circuit QED architecture, where the quantum vacuum's fluctuations are the primary limitation on comb coherence. We achieve a comb phase coherence of up to 35~$μ$s, approaching the theoretical device quantum limit of 55~$μ$s, and vastly longer than the modes' inherent lifetimes of 13~ns. The ability within cQED to engineer stronger nonlinearities than optical microresonators, together with operation at cryogenic temperatures, and excellent agreement of comb dynamics with quantum theory indicates a promising platform for the study of complex dynamics of quantum nonlinear systems
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