We inverse engineer fast rotations of a transversally tight, linear trap with two ions for a predetermined rotation angle and time, avoiding final excitation. Different approaches are analyzed and compared when the ions are of the same species or of different species. The separability into dynamical normal modes for equal ions in a harmonic trap, or for different ions in non-harmonic traps with up to quartic terms allows for simpler computations of the rotation protocols. For non-separable scenarios, in particular for different ions in harmonic traps, rotation protocols are also found using more costly numerical optimisations.

中文翻译：

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两离子链绝热旋转的捷径

我们对具有两个离子的横向紧密线性阱的快速旋转进行逆向工程，以预定旋转角度和时间，避免最终激发。当离子属于同一种类或不同种类时，分析和比较不同的方法。谐波阱中等离子或非谐波阱中不同离子的动态正常模式的可分离性高达四次项，允许更简单地计算旋转协议。对于不可分离的场景，特别是对于谐波陷阱中的不同离子，还发现使用更昂贵的数值优化的旋转协议。