论文标题
弱测量引起的阶段和脱序：几何阶段的对称性损坏
Weak-measurement-induced phases and dephasing: broken symmetry of the geometric phase
论文作者
论文摘要
由一系列弱测量序列引起的量子状态的相干转向已成为理论和实验研究的活跃领域。对于封闭的转向轨迹，潜在的相位因子涉及几何和动态术语。此外，考虑到测量序列的顺序逆转，这种相包含对称和反对称项。取代共同的智慧，我们表明对称和反对称成分分别与动力学和几何部分不符。解决了一类广泛的测量方案，我们进一步研究了诱导阶段对测量参数的依赖性（例如，测量强度）。我们发现在不同拓扑不同的扇区之间的过渡，该扇区由整数值绕组数字定义，并表明过渡伴随着不同的dephasing。我们提出了实验方案来观察这些效果。
Coherent steering of a quantum state, induced by a sequence of weak measurements, has become an active area of theoretical and experimental study. For a closed steered trajectory, the underlying phase factors involve both geometrical and dynamical terms. Furthermore, considering the reversal of the order of the measurement sequence, such a phase comprises a symmetric and an antisymmetric term. Superseding common wisdom, we show that the symmetric and the antisymmetric components do not correspond to the dynamical and geometrical parts respectively. Addressing a broad class of measurement protocols, we further investigate the dependence of the induced phases on the measurement parameters (e.g., the measurement strength). We find transitions between different topologically distinct sectors, defined by integer-valued winding numbers, and show that the transitions are accompanied by diverging dephasing. We propose experimental protocols to observe these effects.
