Entanglement transition from variable-strength weak measurements
Entanglement transition from variable-strength weak measurements
复制标题
可变强度弱测量的纠缠转变
DOI：
10.1103/physrevb.100.064204
复制
发表时间：
2019
影响因子：
3.7
通讯作者：
H. Schomerus
中科院分区：
文献类型：
--
作者：
M. Szyniszewski;A. Romito;H. Schomerus
我们表明，弱测量可以诱导量子相变的相互作用多体系统从一个遍历的热阶段与大熵的非遍历本地化阶段与小熵，但只有当测量强度超过一个临界值。我们证明了随机幺正变换和通用的正算子值测量变量强度下的一维量子电路演化的这种效果。与描述受限类开放系统的投影测量相反，测量设备被建模为连续高斯探针，捕获大类环境。通过采用数据崩溃和研究在过渡的增强的波动，我们得到了一致的相边界的测量强度和测量概率的空间，清楚地表明了一个临界值的测量强度低于该系统总是遍历的，无论测量概率。这些发现通过控制环境为多体系统的量子工程提供了指导。
We show that weak measurements can induce a quantum phase transition of interacting many-body systems from an ergodic thermal phase with a large entropy to a nonergodic localized phase with a small entropy, but only if the measurement strength exceeds a critical value. We demonstrate this effect for a one-dimensional quantum circuit evolving under random unitary transformations and generic positive operator-valued measurements of variable strength. As opposed to projective measurements describing a restricted class of open systems, the measuring device is modeled as a continuous Gaussian probe, capturing a large class of environments. By employing data collapse and studying the enhanced fluctuations at the transition, we obtain a consistent phase boundary in the space of the measurement strength and the measurement probability, clearly demonstrating a critical value of the measurement strength below which the system is always ergodic, irrespective of the measurement probability. These findings provide guidance for quantum engineering of many-body systems by controlling their environment.
影响因子：
3.7
作者：
Li, Yaodong;Chen, Xiao;Fisher, Matthew P. A.
通讯作者：
Fisher, Matthew P. A.
影响因子：
12.5
作者：
Nahum, Adam;Vijay, Sagar;Haah, Jeongwan
通讯作者：
Haah, Jeongwan