Laboratoire Charles Fabry, Institut d'Optique, CNRS, Univ Paris-Sud, Campus Polytechnique, RD 128, 91127 Palaiseau cedex, France.
Phys Rev Lett. 2010 Jan 8;104(1):010502. doi: 10.1103/PhysRevLett.104.010502.
We report the generation of entanglement between two individual 87Rb atoms in hyperfine ground states |F=1,M=1> and |F=2,M=2> which are held in two optical tweezers separated by 4 microm. Our scheme relies on the Rydberg blockade effect which prevents the simultaneous excitation of the two atoms to a Rydberg state. The entangled state is generated in about 200 ns using pulsed two-photon excitation. We quantify the entanglement by applying global Raman rotations on both atoms. We measure that 61% of the initial pairs of atoms are still present at the end of the entangling sequence. These pairs are in the target entangled state with a fidelity of 0.75.
我们报告了在两个相隔 4 微米的光学镊子中处于超精细基态 |F=1，M=1>和 |F=2，M=2>的两个单个 87Rb 原子之间的纠缠的产生。我们的方案依赖于里德堡阻塞效应，该效应阻止了两个原子同时被激发到里德堡态。通过使用脉冲双光子激发，纠缠态在大约 200ns 内产生。我们通过对两个原子施加全局拉曼旋转来量化纠缠。我们测量到在纠缠序列结束时，仍有 61%的初始原子对存在。这些原子对处于目标纠缠态，保真度为 0.75。
