论文标题
马尔可夫开放量子系统中的相关性传播
Spreading of correlations in Markovian open quantum systems
论文作者
论文摘要
了解量子相关性多体系统中量子相关性的传播是物理学的主要挑战之一。对于{\ it隔离}系统，水动力学理论通过准粒子对的传播来解释纠缠的起源和传播。但是，当系统与周围的互动时，已经建立了少得多。在这里，我们表明准粒子图片对于开放量子系统仍然有效：虽然信息仍由准粒子传播，但环境会修改其相关性并引入不一致和混合效果。对于随着增益/损失耗散的自由费，我们提供了完全描述熵和互信息传播的不连贯和准粒子贡献的公式。重要的是，后者不受不连贯的相关性影响。相互信息在短时间内呈指数级降低，并最终消失了经典限制的发作。对数负性的行为相似，这种情况对于其他耗散是共同的。对于弱耗散，准颗粒的存在是显着缩放行为的基础。
Understanding the spreading of quantum correlations in out-of-equilibrium many-body systems is one of the major challenges in physics. For {\it isolated} systems, a hydrodynamic theory explains the origin and spreading of entanglement via the propagation of quasi-particle pairs. However, when systems interact with their surrounding much less has been established. Here we show that the quasi-particle picture remains valid for open quantum systems: while information is still spread by quasiparticles, the environment modifies their correlation and introduces incoherent and mixing effects. For free fermions with gain/loss dissipation we provide formulae fully describing incoherent and quasiparticle contributions in the spreading of entropy and mutual information. Importantly, the latter is not affected by incoherent correlations. The mutual information is exponentially damped at short times and eventually vanishes signalling the onset of a classical limit. The behaviour of the logarithmic negativity is similar and this scenario is common to other dissipations. For weak dissipation, the presence of quasiparticles underlies remarkable scaling behaviors.
