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Decay probability distribution of quantum-mechanical unstable systems and time operator

机译:量子力学不稳定系统和时间算子的衰变概率分布

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We study the decay probability distribution and the survival probability of unstable quantum systems using an explicit formula of the spectral projections of the time operator in the statistical Liouville description for solvable Hamiltonians. We apply this formula to the one-level Friedrichs model to study the decay distribution of the excited decaying state under coupling with a continuum of degrees of freedom. Then we show that this formula eliminates the Zeno effect for short-time decay. We also show that the long-time asymptotic of the survival probability is a sum of an algebraically decaying term and an exponentially decaying one. (c) 2007 Elsevier B.V. All rights reserved.
机译:在可解哈密顿量的统计Liouville描述中,我们使用时间算子的频谱投影的显式公式研究了不稳定量子系统的衰减概率分布和生存概率。我们将此公式应用于一级Friedrichs模型,以研究在具有连续自由度的耦合条件下激发衰减态的衰减分布。然后我们证明该公式消除了短期衰减的芝诺效应。我们还表明,生存概率的长期渐近性是代数衰减项和指数衰减项的总和。 (c)2007 Elsevier B.V.保留所有权利。

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