论文标题
几乎量子限制的约瑟夫森结频梳合成器
Nearly quantum-limited Josephson-junction Frequency Comb synthesizer
论文作者
论文摘要
尽管相干驱动的Kerr微腔已迅速成熟作为频率梳形成的平台，但这种微孔子通常具有较弱的Kerr系数。因此，触发梳子产生需要数百万个光子在腔内循环。这抑制了量子波动在梳子动力学中的作用。在本文中，我们意识到了电路QED架构中相干驱动的Kerr介导的微波频率梳的最小版本，其中量子真空的波动是梳子连贯性的主要限制。我们达到了高达35〜 $μ$ s的梳相干性，接近理论设备量子限制为55〜 $μ$ S，并且比模式的固有寿命为13〜ns。 CQED内部与光学微孔子相比，CQED的能力更强的非线性，以及在低温温度下的运行，以及与量子理论的梳子动力学的极好一致性，这表明了研究量子非线性系统复杂动力学的有希望的平台
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
