Nonadiabatic motional effects and dissipative blockade for Rydberg atoms excited from optical lattices or microtraps.
Nonadiabatic motional effects and dissipative blockade for Rydberg atoms excited from optical lattices or microtraps.
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DOI：
10.1103/physrevlett.110.213005
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发表时间：
2013-03
影响因子：
8.6
通讯作者：
Weibin Li;C. Ates;I. Lesanovsky
中科院分区：
文献类型：
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作者：
Weibin Li;C. Ates;I. Lesanovsky
超冷气体中里德伯原子的激光激发通常被描述为假设原子运动在激发时间内被冻结。我们证明，对于光学晶格或微陷阱中的原子来说，这种冷冻气体近似可以分解。特别是，我们表明，激发动力学通常受到里德伯原子之间的机械力以及原子波包在限制势中的传播的强烈影响。这会导致激励动力学退相干，从而导致耗散封锁效应，即使在反封锁状态下，也会导致里德伯激励效率低下。对于强非共振激光激发（通常在里德伯修整的背景下考虑），这些运动效应损害了玻恩-奥本海默近似的适用性。特别是，我们的结果表明，它们还会导致敷料制度中的脱相干。
The laser excitation of Rydberg atoms in ultracold gases is often described assuming that the atomic motion is frozen during the excitation time. We show that this frozen gas approximation can break down for atoms that are held in optical lattices or microtraps. In particular, we show that the excitation dynamics is in general strongly affected by mechanical forces among the Rydberg atoms as well as the spread of the atomic wave packet in the confining potential. This causes decoherence in the excitation dynamics-resulting in a dissipative blockade effect-that renders the Rydberg excitation inefficient even in the antiblockade regime. For a strongly off-resonant laser excitation-usually considered in the context of Rydberg dressing-these motional effects compromise the applicability of the Born-Oppenheimer approximation. In particular, our results indicate that they can also lead to decoherence in the dressing regime.