Physikalisches Institut, Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany.
Zentrum für Optische Quantentechnologien, Universität Hamburg, Fachbereich Physik, Luruper Chaussee 149, 22761 Hamburg, Germany.
Phys Rev Lett. 2019 Nov 1;123(18):180502. doi: 10.1103/PhysRevLett.123.180502.
Quantum theory predicts intriguing dynamics during drastic changes of external conditions. We switch the trapping field of two ions sufficiently fast to tear apart quantum fluctuations, i.e., create pairs of phonons and, thereby, squeeze the ions' motional state. This process can be interpreted as an experimental analog to cosmological particle creation and is accompanied by the formation of spatial entanglement. Hence, our platform allows one to study the causal connections of squeezing, pair creation, and entanglement and might permit one to cross-fertilize between concepts in cosmology and applications of quantum information processing.
量子理论预测了在外场剧烈变化过程中的有趣动力学。我们足够快地切换两个离子的囚禁场以撕裂量子涨落，即产生声子对，并由此压缩离子的运动状态。这个过程可以被解释为宇宙中粒子产生的实验模拟，同时伴随着空间纠缠的形成。因此，我们的平台允许研究压缩、对产生和纠缠之间的因果关系，并可能在宇宙学概念和量子信息处理应用之间实现交叉授粉。
