论文标题
测量保护量子相
Measurement Protected Quantum Phases
论文作者
论文摘要
我们介绍了一类带有随机单位和投影测量值的混合量子电路，这些电路在稳态的区域法律纠缠阶段中有远程顺序。我们的主要例子是尊重全局伊斯林对称性和两种相互竞争的测量类型的电路。该相图具有带有自旋玻璃顺序的区域定律阶段，该阶段直接过渡到具有体积定律纠缠的顺磁性阶段以及关键方案。使用相互信息诊断，我们发现保留全球对称性的这种纠缠过渡是在新的普遍性类别中。我们将这种混合电路对更高维度的概括进行了分析，这允许秩序和数量定律纠缠的共存以及拓扑顺序，而无需任何对称限制。
We introduce a class of hybrid quantum circuits, with random unitaries and projective measurements, which host long-range order in the area law entanglement phase of the steady state. Our primary example is circuits with unitaries respecting a global Ising symmetry and two competing types of measurements. The phase diagram has an area law phase with spin glass order, which undergoes a direct transition to a paramagnetic phase with volume law entanglement, as well as a critical regime. Using mutual information diagnostics, we find that such entanglement transitions preserving a global symmetry are in new universality classes. We analyze generalizations of such hybrid circuits to higher dimensions, which allow for coexistence of order and volume law entanglement, as well as topological order without any symmetry restrictions.
