Population dynamics in sideband cooling of trapped ions outside the Lamb-Dicke regime
Population dynamics in sideband cooling of trapped ions outside the Lamb-Dicke regime
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DOI：
10.1103/physreva.99.013423
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发表时间：
2018-09
影响因子：
2.9
通讯作者：
M. Joshi;P. Hrmo;V. Jarlaud;F. Oehl;R. Thompson
中科院分区：
文献类型：
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作者：
M. Joshi;P. Hrmo;V. Jarlaud;F. Oehl;R. Thompson
我们给出了原子离子在浅势阱中光学边带冷却的模拟结果。在这样的陷阱中，离子不能被多普勒冷却到接近Lamb-Dicke区（$\eta^2(2n+1) \ll 1$）。在Lamb-Dicke状态之外，边带冷却动力学被各种Fock状态的存在所改变，在这些状态下冷却变得非常缓慢。在Penning阱中捕获的钙离子实现了这种情况，因此单级冷却对制备处于运动基态的离子是低效的。对于这些系统，有必要详细研究冷却动力学，并且我们表明有可能实现优化的冷却顺序以实现有效的基态冷却。我们还模拟了在Penning阱中捕获的两个离子的冷却动力学，其中存在额外的运动模式需要复杂的冷却序列，以便同时将两个轴向模式冷却到基态。此外，我们研究了单离子在潘宁阱中的边带加热。
We present the results of simulations of optical sideband cooling of atomic ions in a trap with a shallow potential well. In such traps, an ion cannot be Doppler cooled near to the Lamb-Dicke regime ($\eta^2(2n+1) \ll 1$). Outside the Lamb-Dicke regime, the sideband cooling dynamics are altered by the existence of various Fock states where the cooling becomes very slow. A calcium ion trapped in our Penning trap realises such a situation, hence single stage cooling is inefficient to prepare the ion in the motional ground state. For these systems, it is necessary to study the cooling dynamics in detail and we show that it is possible to implement an optimised cooling sequence to achieve efficient ground state cooling. We also present the simulated cooling dynamics of two ions trapped in a Penning trap, where the presence of an additional motional mode requires a complicated cooling sequence in order to cool both axial modes to the ground state simultaneously. Additionally we investigate sideband heating of a single ion in a Penning trap.