论文标题
量子zeno效应分阶段出现
Quantum Zeno effect appears in stages
论文作者
论文摘要
在量子zeno效应中，量子测量可以通过将其状态冷冻到测量本特征状态之一来阻断两级系统的相干振荡。该效果通常由测量频率控制。在这里，我们研究了ZENO制度的发展，这是连续部分测量的测量强度的函数。我们表明，随着测量强度的提高，系统动力学中的$ \ textit {cascade {cascade cascade {cascade cascade of Textit {cascade''的开始。其中一些过渡仅在单个量子轨迹的集体行为中显而易见，并且对于平均动力学是看不见的。它们包括在状态的稳态概率分布中的动态不可接近状态和奇异性区域的出现。这些新预测的动力学特征，可以在当前的实验中很容易观察到，这表明了从根本上不可预测的量子跳跃共存，而这些量子跳跃与最近的实验中不断监测和恢复的量子共存。
In the quantum Zeno effect, quantum measurements can block the coherent oscillation of a two level system by freezing its state to one of the measurement eigenstates. The effect is conventionally controlled by the measurement frequency. Here we study the development of the Zeno regime as a function of the measurement strength for a continuous partial measurement. We show that the onset of the Zeno regime is marked by a $\textit{cascade of transitions}$ in the system dynamics as the measurement strength is increased. Some of these transitions are only apparent in the collective behavior of individual quantum trajectories and are invisible to the average dynamics. They include the appearance of a region of dynamically inaccessible states and of singularities in the steady-state probability distribution of states. These newly predicted dynamical features, which can be readily observed in current experiments, show the coexistence of fundamentally unpredictable quantum jumps with those continuously monitored and reverted in recent experiments.
