Quantum simulation of Unruh radiation
Quantum simulation of Unruh radiation
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DOI：
10.1038/s41567-019-0537-1
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发表时间：
2019-08-01
期刊：
影响因子：
19.6
通讯作者：
Chin, Cheng
中科院分区：
文献类型：
--
作者：
Hu, Jiazhong;Feng, Lei;Chin, Cheng
弯曲时空中量子现象的探索是广义相对论(1-4)、热力学(4-6)和量子信息(7,8)之间交叉学科的新兴跨学科领域。该领域的一个著名预测是安鲁热辐射(3)——在加速参考系中观察时来自明可夫斯基真空的热辐射的表现。在这里，我们报告了对具有热波动的物质场的实验观察，这与昂鲁的预测一致。物质场是在非惯性系中模拟量子物理的框架内生成的，该框架基于玻色-爱因斯坦凝聚体，这些凝聚体经过参数调制 (9) 以使它们的演化复制框架变换。我们进一步观察了物质波辐射的长程相位相干性和时间反转，这是昂鲁辐射与其经典辐射的区别的标志。我们的演示为研究弯曲时空中量子多体系统的动力学提供了新途径。
The exploration of quantum phenomena in a curved spacetime is an emerging interdisciplinary area at the interface between general relativity(1-4), thermodynamics(4-6) and quantum information(7,8). One famous prediction in this field is Unruh thermal radiation(3)-the manifestation of thermal radiation from a Minkowski vacuum when viewed in an accelerating reference frame. Here, we report the experimental observation of a matter field with thermal fluctuations that agree with Unruh's predictions. The matter field is generated within a framework for the simulation of quantum physics in a non-inertial frame, based on Bose-Einstein condensates that are parametrically modulated(9) to make their evolution replicate the frame transformation. We further observe long-range phase coherence and temporal reversal of the matter-wave radiation, hallmarks that distinguish Unruh radiation from its classical counterpart. Our demonstration offers a new avenue for the investigation of the dynamics of quantum many-body systems in a curved spacetime.