The effective lifetime of a quantum state can increase (the quantum Zeno effect) or decrease (the quantum anti-Zeno effect) in the response to increasing frequency of the repeated measurements and the multiple transitions between these two regimes are potentially possible within the same system. An interesting question arising in this regards is how to choose the optimal schedule of repeated measurements to achieve the maximal possible decay rate of a given quantum state. Addressing the issue of optimality in the quantum Zeno dynamics, we derive a range of rigorous results, which are, due to generality of the theoretical framework adopted here, applicable to the majority of models appeared in the quantum Zeno literature. In particular, we prove the universal dominance of the regular stroboscopic sampling in the sense that it always provides the shortest expected decay time among all possible measurement procedures. However, the implementation of the stroboscopic protocol require...

中文翻译：

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量子芝诺动力学的最优性和普遍性

响应重复测量频率的增加，量子态的有效寿命可以增加（量子芝诺效应）或降低（量子反泽诺效应），并且在同一系统中这两种状态之间可能会发生多次跃迁。在这方面出现的一个有趣的问题是如何选择重复测量的最佳时间表，以实现给定量子态的最大可能衰减率。针对量子芝诺动力学中的最优性问题，我们得出了一系列严格的结果，由于这里采用的理论框架的普遍性，这些结果适用于量子芝诺文学中出现的大多数模型。尤其是，我们在所有可能的测量程序中始终提供最短的预期衰减时间的意义上证明了常规频闪采样的普遍优势。然而，频闪协议的实施需要...