论文标题
原子冷凝物和声子激光动力学不稳定性中圆形移动检测器的零点激发
Zero-point excitation of a circularly moving detector in an atomic condensate and phonon laser dynamical instabilities
论文作者
论文摘要
我们研究了原子冷凝物中的循环运动杂质，以实现桌面实验中的超沉淀现象。杂质与冷凝物的密度波动耦合，在量子场理论语言中，它是量子声子场的检测器的类似物。对于足够大的旋转速度，即使当冷凝水最初处于其基态状态时，声子场的零点波动也会引起探测器的较高激发率。对于空间限制的冷凝物和谐波探测器，这种声波的超级发射提供了动态的不稳定性机制，从而导致了一个新的声子激光概念。遵循与旋转黑洞理论的类比，我们的结果提出了一个有希望的途径来模拟涉及弯曲空间时间快速移动探测器的基本相互作用过程。
We study a circularly moving impurity in an atomic condensate for the realisation of superradiance phenomena in tabletop experiments. The impurity is coupled to the density fluctuations of the condensate and, in a quantum field theory language, it serves as an analog of a detector for the quantum phonon field. For sufficiently large rotation speeds, the zero-point fluctuations of the phonon field induce a sizeable excitation rate of the detector even when the condensate is initially at rest in its ground state. For spatially confined condensates and harmonic detectors, such a superradiant emission of sound waves provides a dynamical instability mechanism leading to a new concept of phonon lasing. Following an analogy with the theory of rotating black holes, our results suggest a promising avenue to quantum simulate basic interaction processes involving fast moving detectors in curved space-times.
