Welte Stephan, Hacker Bastian, Daiss Severin, Ritter Stephan, Rempe Gerhard
Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany.
Phys Rev Lett. 2017 May 26;118(21):210503. doi: 10.1103/PhysRevLett.118.210503.
We demonstrate entanglement generation of two neutral atoms trapped inside an optical cavity. Entanglement is created from initially separable two-atom states through carving with weak photon pulses reflected from the cavity. A polarization rotation of the photons heralds the entanglement. We show the successful implementation of two different protocols and the generation of all four Bell states with a maximum fidelity of (90±2)%. The protocol works for any distance between cavity-coupled atoms, and no individual addressing is required. Our result constitutes an important step towards applications in quantum networks, e.g., for entanglement swapping in a quantum repeater.
我们展示了被困在光学腔内的两个中性原子的纠缠产生。通过用从腔内反射的弱光子脉冲进行“雕刻”，从初始可分离的双原子态创建纠缠。光子的偏振旋转预示着纠缠的产生。我们展示了两种不同协议的成功实施以及所有四个贝尔态的产生，最大保真度为(90±2)%。该协议适用于腔耦合原子之间的任何距离，并且不需要单独寻址。我们的结果是朝着量子网络应用迈出的重要一步，例如用于量子中继器中的纠缠交换。
