arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.09577quant-phcond-mat.dis-nncond-mat.stat-mechnlin.AO
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自由费米子非幺正随机动力学中的突现共形对称性

Emergent conformal symmetry in non-unitary random dynamics of free fermions

Xiao Chen, Yaodong Li, Matthew P. A. Fisher, Andrew Lucas

摘要:

本文提出了一维自由费米子非幺正量子动力学的随机量子线路模型。数值模拟结果表明,随着纠缠面积和关联函数对数律的破坏,系统趋于稳态。此外,从一个短程纠缠多体态出发,纠缠和关联的动力学演化与具有类空时间方向的二维共形场论的预言定量一致。我们认为,这种行为是通用的非幺正自由量子动力学与时间相关的随机性,并表明,两点函数的涌现共形动力学产生了一个简单的“非线性主方程”。

英文摘要:

We present random quantum circuit models for non-unitary quantum dynamics of free fermions in one spatial dimension. Numerical simulations reveal that the dynamics tends towards steady states with logarithmic violations of the entanglement area law and power law correlation functions. Moreover, starting with a short-range entangled many-body state, the dynamical evolution of entanglement and correlations quantitatively agrees with the predictions of two-dimensional conformal field theory with a space-like time direction. We argue that this behavior is generic in non-unitary free quantum dynamics with time-dependent randomness, and show that the emergent conformal dynamics of two-point functions arises out of a simple "nonlinear master equation".

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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