论文标题
通过关键耦合和黑暗纠缠状态实现的地面冷却
Ground-state cooling enabled by critical coupling and dark entangled states
论文作者
论文摘要
我们通过开放的量子系统方法分析了与相互作用的两级系统相互作用的合奏的机械谐振器的冷却。使用精确的分析结果，我们发现当将声子模式严格耦合（$γ\ sim g $）到两级系统集合时，就会发现最佳冷却。典型系统由于耗时衰减率$γ$与耦合因子$ g $之间的固有参数不匹配（$γ\ gg g $）而在次优冷却方案中运行。为了克服这一障碍，我们表明，通过机械谐振器的应变曲线仔细地工程化耦合参数，可以使声子冷却通过\ emph {emploting}集合的黑暗（次级）纠缠态进行，从而导致最佳声音冷却。我们的结果为地面冷却提供了新的途径，应进行实验演示。
We analyze the cooling of a mechanical resonator coupled to an ensemble of interacting two-level systems via an open quantum systems approach. Using an exact analytical result, we find optimal cooling occurs when the phonon mode is critically coupled ($γ\sim g$) to the two-level system ensemble. Typical systems operate in sub-optimal cooling regimes due to the intrinsic parameter mismatch ($γ\gg g$) between the dissipative decay rate $γ$ and the coupling factor $g$. To overcome this obstacle, we show that carefully engineering the coupling parameters through the strain profile of the mechanical resonator allows phonon cooling to proceed through the dark (subradiant) entangled states of an \emph{interacting} ensemble, thereby resulting in optimal phonon cooling. Our results provide a new avenue for ground-state cooling and should be accessible for experimental demonstrations.
