Dynamics and control of fast ion crystal splitting in segmented Paul traps
Dynamics and control of fast ion crystal splitting in segmented Paul traps
复制标题
分段保罗陷阱中快离子晶体分裂的动力学和控制
DOI：
10.1088/1367-2630/16/7/073012
复制
发表时间：
2014
影响因子：
3.3
通讯作者：
U. G. Poschinger
中科院分区：
文献类型：
--
作者：
H. Kaufmann;T. Ruster;C. T. Schmiegelow;F. Schmidt-Kaler;U. G. Poschinger
我们从理论上研究了分节保罗阱中两个离子晶体的分裂过程，即两个离子从被限制在一个共同阱中的结构转变为被限制在单独阱中的离子。通过在阱段上施加合适的电压坡道来精确控制这一过程是非常重要的，因为在这一过程中谐波约束会瞬间消失。这使得离子对背景电场噪声和阱轴方向上的静态偏移场非常敏感。我们分析了脉冲加速度、残余背景场的存在和异常加热的增强是产生大量能量传递的原因。对于脉冲加速度，我们确定了绝热和绝热状态，它们的特征是能量传递相对于时间的不同标度行为。我们提出了一种基于实验可及参数的合适控制方案。仿真结果验证了分割结果的高灵敏度和控制方案的性能。最后，我们分析了陷阱几何参数对晶体分裂过程的影响。
We theoretically investigate the process of splitting two-ion crystals in segmented Paul traps, ie the structural transition from two ions confined in a common well to ions confined in separate wells. The precise control of this process by application of suitable voltage ramps to the trap segments is non-trivial, as the harmonic confinement transiently vanishes during the process. This makes the ions strongly susceptible to background electric field noise, and to static offset fields in the direction of the trap axis. We analyze the reasons why large energy transfers can occur, which are impulsive acceleration, the presence of residual background fields and enhanced anomalous heating. For the impulsive acceleration, we identify the diabatic and adiabatic regimes, which are characterized by different scaling behavior of the energy transfer with respect to time. We propose a suitable control scheme based on experimentally accessible parameters. Simulations are used to verify both the high sensitivity of the splitting result and the performance of our control scheme. Finally, we analyze the impact of trap geometry parameters on the crystal splitting process.