超相干机电系统的基态冷却
Ground State Cooling of an Ultracoherent Electromechanical System
摘要：
腔机电学依赖于微波和机械模式之间的参数耦合来操纵机械量子态，并在混合量子系统的不同部分之间提供相干界面。机械模式的高相干性在这样的应用中是至关重要的，以便保护其宿主的量子态免受热退相干。在这里，我们介绍了一个机电系统的基础上，周围的软夹持机械谐振器具有极高的Q值（> $10^9$），在非常低的温度（30 mK）举行。这种超相干机械谐振器是电容耦合到微波模式，强大到足以使基态冷却的机制（$\bar{n}_\mathrm{min}= 0.76\pm 0.16$）。这为利用这种系统提供的极长相干时间（$t_ \mathrm{coh} >100 ms）进行量子信息处理和状态转换铺平了道路。
英文摘要：
Cavity electromechanics relies on parametric coupling between microwave and mechanical modes to manipulate the mechanical quantum state, and provide a coherent interface between different parts of hybrid quantum systems. High coherence of the mechanical mode is of key importance in such applications, in order to protect the quantum states it hosts from thermal decoherence. Here, we introduce an electromechanical system based around a soft-clamped mechanical resonator with an extremely high Q-factor (>$10^9$) held at very low (30 mK) temperatures. This ultracoherent mechanical resonator is capacitively coupled to a microwave mode, strong enough to enable ground-state-cooling of the mechanics ($\bar{n}_\mathrm{min}= 0.76\pm 0.16$). This paves the way towards exploiting the extremely long coherence times ($t_\mathrm{coh}>100 ms) offered by such systems for quantum information processing and state conversion.
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