论文标题
在结构化旋转环境中的量子达尔文主义
Quantum Darwinism in a structured spin environment
论文作者
论文摘要
当感兴趣的系统与复杂的结构化环境相互作用时,我们研究了量子达尔文主义特征的出现和抑制。我们介绍了一种扩展的自旋型型号,该模型将系统耦合到$ n $独立的自旋链。然后,链的每个站点都生活在环境的确定层中,因此我们将其称为“洋葱”模型。我们修复了系统环境的相互作用,以便如果环境由单层组成,则可以保证经典的客观性。考虑到所有组成子系统的完全分解的初始状态,然后我们研究量子量子darwinism的签名的出现和增殖如何非常依赖于链的相互作用,并确定当链条被认为是不可切除的片段时,始终会在瞬时地观察到不可切除的片段。相反,观察特定层中的冗余编码对相互作用的性质高度敏感。最后,我们考虑了在相互作用的哈密顿量的基础状态下初始化每个链的情况,并确定该案例具有分解的初始状态案例的定性特征,但是现在,现在所施加的磁场的强度对是否可以观察到量子性达尔文主义有重大影响。我们证明,可以通过使用总互信息和全局量子不便在层中分析层中的相关性来理解量子darwinistic特征的存在或不存在。
We examine the emergence and suppression of signatures of quantum Darwinism when the system of interest interacts with a complex, structured environment. We introduce an extended spin-star model where the system is coupled to $N$ independent spin-chains. Each site of the chain then lives in a definite layer of the environment, and hence we term this the "onion" model. We fix the system-environment interaction such that classical objectivity is guaranteed if the environment consists of a single layer. Considering a fully factorized initial state for all constituent sub-systems, we then examine how the emergence and proliferation of signatures of quantum Darwinism are delicately dependent on the chain interaction, establishing that when the chains are considered as indivisible fragments to be interrogated, characteristic redundancy plateaux are always observed at least transiently. In contrast, observing a redundant encoding in a specific layer is highly sensitive to the nature of the interaction. Finally, we consider the case in which each chain is initialized in the ground state of the interaction Hamiltonian, establishing that this case shares the qualitative features of the factorized initial state case, however now the strength of the applied magnetic field has a significant impact on whether quantum Darwinism can be observed. We demonstrate that the presence or absence of quantum Darwinistic features can be understood by analysing the correlations within a layer using total mutual information and global quantum discord.