论文标题
无效监控的免费费米子
Disordered monitored free fermions
论文作者
论文摘要
由于测量和定位，可以阻碍统一进化中量子信息的争夺，从而在稳定状态下抑制纠缠的真实空间中的量子机械波形。在受监视的自由花费模型中，稳定状态从对数纠缠临界状态到区域法的纠缠过渡。但是，混乱会导致安德森本地化。我们通过连续监测研究了随机电势中的自由费，这使我们能够探测测量诱导的相位和局部相之间的相互作用。我们表明，临界阶段是稳定的，直到有限疾病，临界阶段与Berezinskii-Kosterlitz-无尽的普遍性一致。此外，监测摧毁了定位，而弱耗散处的区域法相表现出单粒子波函数的幂律衰减。我们的工作打开了探测量子点阵列和纳米线的电子系统中这种新型相变的途径，并允许对纠缠状态的量子控制。
Scrambling of quantum information in unitary evolution can be hindered due to measurements and localization, which pin quantum mechanical wavefunctions in real space suppressing entanglement in the steady state. In monitored free-fermionic models, the steady state undergoes an entanglement transition from a logarithmically entangled critical state to area-law. However, disorder can lead to Anderson localization. We investigate free fermions in a random potential with continuous monitoring, which enables us to probe the interplay between measurement-induced and localized phases. We show that the critical phase is stable up to a finite disorder and the criticality is consistent with the Berezinskii-Kosterlitz-Thouless universality. Furthermore, monitoring destroys localization, and the area-law phase at weak dissipation exhibits power-law decay of single-particle wave functions. Our work opens the avenue to probe this novel phase transition in electronic systems of quantum dot arrays and nanowires, and allow quantum control of entangled states.
