Manipulating dynamical evolution is an important task in quantum information. The sudden death phenomenon (SDP), which is predicted to be unattainable beyond entanglement [1], would be an especially surprising feature in quantum coherence. In this work, we modulate the spatial modes of photons and build a spatially inclined channel using a series of specially made quartz plate pairs. Within this channel, sudden changes in coherence occur in open-quantum systems. We then describe the SDP within a general theoretical framework of sudden quantum-coherence changes and by defining the nth-order sudden coherence change. Moreover, by adding non-Markovian noise, we find that coherence can rebirth after a sudden death. We further compare the sudden change features in coherence and quantum entanglement. We find that both coherence and entanglement perform identical dynamical processes upon Bell diagonal states, although their dynamical characteristics change when the initial state is partially entangled. Our results provide insights into the sudden change phenomena of quantum correlations beyond entanglement, along with intriguing perspectives on quantum coherence dynamics.

中文翻译：

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环境引起的量子系统相干突变

操纵动力学演化是量子信息中的重要任务。预计突然死亡现象（SDP）超出纠缠[1]无法实现，这将是量子相干性中特别令人惊讶的特征。在这项工作中，我们调制光子的空间模式，并使用一系列特制的石英板对构建空间倾斜的通道。在此通道内，开放量子系统中相干性突然发生变化。然后，我们在突然的量子相干变化的一般理论框架内并通过定义n阶突然相干变化来描述SDP。此外，通过添加非马尔可夫噪声，我们发现相干性可以在突然死亡后重生。我们进一步比较了相干和量子纠缠中的突变特征。我们发现相干和纠缠对贝尔对角线状态都执行相同的动力学过程，尽管当初始状态部分纠缠时它们的动力学特性会改变。我们的结果提供了对纠缠之外的量子相关性突然变化现象的深刻见解，以及对量子相干动力学的有趣观点。