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arXiv 2512.02100cond-mat.dis-nncond-mat.stat-mechquant-ph
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强无序自旋链中测量诱导的相变

The measurement-induced phase transition in strongly disordered spin chains

Rutgers University(罗格斯大学);University of Geneva(日内瓦大学);University College London(伦敦大学学院);Flatiron Institute(平顿研究所)

Yicheng Tang, Pradip Kattel, Arijeet Pal, Emil A. Yuzbashyan, J. H. Pixley

AI总结:

该研究探讨了强无序自旋链中测量诱导相变的机制,发现测量密度引发体积定律纠缠相,并通过临界测量率确定相变点。

摘要:

我们研究了在存在随机局部测量的情况下强无序自旋链的动力学。通过研究具有位依赖随机纵向场和有效l-位许多体局域哈密顿量的横向场异斯林模型,我们表明预热和MBL区域对任何方向的局部测量都是不稳定的。任何非零测量密度都会引发一个体积定律纠缠相,随后随着测量率的进一步增加而过渡到面积定律状态。临界测量率pc,其中发生相变,与无序强度W和测量算符与本地积分运动O之间的平均重叠呈指数关系,即pc~exp[-αW/(1-O²)]。在测量诱导的体积定律相中,饱和时间尺度为ts~L,与在p=0时预热和MBL区域中指数慢的饱和时间尺度ts~e^{aL}形成对比。

英文摘要:

We investigate the dynamics of strongly disordered spin chains in the presence of random local measurements. By studying the transverse-field Ising model with a site-dependent random longitudinal field and an effective $l$-bit many-body localized Hamiltonian, we show that the prethermal and MBL regimes are unstable to local measurements along any direction. Any non-zero measurement density induces a volume-law entangled phase with a subsequent phase transition into an area-law state as the measurement rate is further increased. The critical measurement rate $p_c$, where the transition occurs, is exponentially small in the strength of disorder $W$ and the average overlap between the measurement operator and the local integrals of motion $O$ as $p_c \sim \exp[-αW/(1-O^2)]$. In the measurement-induced volume-law phase, the saturation time scales as $t_s \sim L $, contrasting the exponentially slow saturation $t_s \sim e^{aL}$ in the prethermal and MBL regimes at $p = 0$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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