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arXiv 1804.01320quant-ph
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自由空间原子辐射衰变中反Zeno效应的观测条件

Conditions for anti-Zeno effect observation in free-space atomic radiative decay

Emmanuel Lassalle, Caroline Champenois, Brian Stout, Vincent Debierre, Thomas Durt

摘要:

频繁的测量可以改变不稳定量子态相对于费米黄金法则给出的自由动力学的衰变。在一篇具有里程碑意义的文章中,自然405,546(2000),Kofman和Kurizki得出结论,在量子衰变过程中,通过频繁测量加速衰变,称为量子反芝诺效应(AZE),似乎无处不在,而它的对应物,量子芝诺效应,是无法实现的。然而,到目前为止,还没有对自由空间中原子辐射衰变(自发发射)的AZE进行实验观测。在这项工作中,利用氢原子的分析结果,我们发现,在自由空间中,只有非电偶极跃迁应该呈现可观察到的AZE,揭示了这种效应因此比最初预测的要普遍得多。然后,我们提出了一个实验方案的AZE观测,涉及的D 5/2和S 1/2之间的最重的碱土金属离子Ca +和Sr +的电四极跃迁。所提出的协议是基于STIRAP技术,它的作用就像一个失相准测量。

英文摘要:

Frequent measurements can modify the decay of an unstable quantum state with respect to the free dynamics given by Fermi's golden rule. In a landmark article, Nature 405, 546 (2000), Kofman and Kurizki concluded that in quantum decay processes, acceleration of the decay by frequent measurements, called the quantum anti-Zeno effect (AZE), appears to be ubiquitous, while its counterpart, the quantum Zeno effect, is unattainable. However, up to now there have been no experimental observations of the AZE for atomic radiative decay (spontaneous emission) in free space. In this work, making use of analytical results available for hydrogen-like atoms, we find that in free space, only non-electric-dipolar transitions should present an observable AZE, revealing that this effect is consequently much less ubiquitous than first predicted. We then propose an experimental scheme for AZE observation, involving the electric quadrupole transition between D 5/2 and S 1/2 in the heaviest alkali-earth ions Ca + and Sr +. The proposed protocol is based on the STIRAP technique which acts like a dephasing quasi-measurement.

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