论文标题
测量光学谐振器中的高阶声子相关性
Measuring High-Order Phonon Correlations in an Optomechanical Resonator
论文作者
论文摘要
我们使用单个光子探测器来探测超氟$^4 $ He He的质量$ \ sim1 $ ng的动作状态。 Stokes和Anti-Stokes光子的到达时间（由谐振器的声学模式散射）用于测量谐振器的声子相干到第四阶。通过对光子检测事件进行选择后，当添加或减去$ \ leq3 $声子时，我们还测量了谐振器中的相干。发现这些测量值与假定声学模式在热平衡中的预测一致，并通过马尔可夫耦合进行浴缸。
We use single photon detectors to probe the motional state of a superfluid $^4$He resonator of mass $\sim1$ ng. The arrival times of Stokes and anti-Stokes photons (scattered by the resonator's acoustic mode) are used to measure the resonator's phonon coherences up to the fourth order. By post-selecting on photon detection events, we also measure coherences in the resonator when $\leq3$ phonons have been added or subtracted. These measurements are found to be consistent with predictions that assume the acoustic mode to be in thermal equilibrium with a bath through a Markovian coupling.
