Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany.
Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria.
Science. 2018 Apr 27;360(6387):416-418. doi: 10.1126/science.aao2035.
Modern quantum technologies in the fields of quantum computing, quantum simulation, and quantum metrology require the creation and control of large ensembles of entangled particles. In ultracold ensembles of neutral atoms, nonclassical states have been generated with mutual entanglement among thousands of particles. The entanglement generation relies on the fundamental particle-exchange symmetry in ensembles of identical particles, which lacks the standard notion of entanglement between clearly definable subsystems. Here, we present the generation of entanglement between two spatially separated clouds by splitting an ensemble of ultracold identical particles prepared in a twin Fock state. Because the clouds can be addressed individually, our experiments open a path to exploit the available entangled states of indistinguishable particles for quantum information applications.
现代量子技术在量子计算、量子模拟和量子计量学领域需要创建和控制大量纠缠粒子的集合。在中性原子的超冷集合中，已经通过数千个粒子之间的相互纠缠生成了非经典态。纠缠的产生依赖于相同粒子集合中的基本粒子交换对称性，这种对称性缺乏明确可定义子系统之间的标准纠缠概念。在这里，我们通过分裂处于孪生 Fock 态的超冷相同粒子集合来生成两个空间分离的云之间的纠缠。由于可以单独寻址云，因此我们的实验为利用不可区分粒子的可用纠缠态开辟了一条量子信息应用的途径。
