标题： 使用里德伯态和交流斯塔克位移实现钡离子量子比特的快速可编程纠缠 显示英文标题

标题： Fast programmable entanglement of Barium ion qubits using Rydberg states and AC-Stark shifts

摘要： 一种利用俘获钡离子的里德伯态进行激发和个体寻址的方案被提出，目的是实现快速门操作和纠缠。 偶极矩矩阵元、动态极化率以及一光子和二光子跃迁强度是通过超对称威克-克莱默-布里路（SWKB）方法计算的。 识别出一个有利的二光子激发跃迁，将7s$1/2$状态与高能级的里德伯态联系起来，最强的跃迁被发现为7s12->38s12。 此外，7s1/2 状态在通信波段1310 nm附近表现出高的极化率，使得在低功率下使用即插即用激光器可以显著控制交流斯塔克位移。 这通过改变离子晶体上的光强实现了个体寻址方案，支持离子对之间的亚微秒级纠缠门操作，利用强且可调谐微波的里德伯偶极相互作用。 提出使用6p3/2->7s1/2 跃迁通过激光频率调谐选择性地寻址单个离子。 显示英文摘要

摘要： A scheme for excitation and individual addressing using Rydberg states of trapped Barium ions is presented for the purpose of fast gates and entanglement. Dipole matrix elements, dynamic polarizabilities, and one- and two-photon transition strengths are computed with a Supersymmetric Wentzel-Kramers-Brillouin (SWKB) method. A favorable two-photon excitation transition is identified, linking the 7s$1/2$ state to high-lying Rydberg states, with the strongest transition found to be 7s12->38s12. Additionally, the 7s1/2 state exhibits high polarizability around the telecom band at 1310 nm, enabling significant AC-Stark shift control with a turnkey laser at low power. This facilitates an individual addressing scheme by varying light intensity across an ion crystal, supporting sub-microsecond entangling gates between ion pairs with the strong and microwave-tunable Rydberg dipolar interaction. Selective addressing of individual ions by laser frequency tuning using the 6p3/2->7s1/2 transition is proposed.