论文标题
不完美的信息传播到嘈杂的环境以自我进化
Non-perfect propagation of information to noisy environment with self-evolution
论文作者
论文摘要
我们研究信息不完美的传播,以不断发展的低维环境,包括自我进化和嘈杂的初始状态,并分析客观化程度和环境参数之间的相互关系。特别是,我们考虑了三个相互作用量子位的分析模型,并得出其客观性参数。数值分析表明,在互动过程中形成的光谱广播结构的质量可能在环境的自我动力学及其混合性的速度下表现出非单调性。前者效果特别强烈,表明 - 将环境的一部分视为测量设备 - 外部磁场作用在环境上的增加可能会使非常模糊的测量变成接近理想。上述效果表明,量子客观性可能在增加环境的动力学之后出现,尽管不是关于指针的基础,而是我们称之为广义指针或指标基础的其他一些。此外,似乎当客观性较差时,至少可以通过增加热噪声来改善它。我们通过分析较高数量的Qubits的距离,以分析代表完美客观性的距离的上限来提供进一步的证据。
We study the non-perfect propagation of information to evolving low-dimensional environment that includes self-evolution as well as noisy initial states and analyze interrelations between the degree of objectivization and environment parameters. In particular, we consider an analytical model of three interacting qubits and derive its objectivity parameters. The numerical analysis shows that the quality of the spectrum broadcast structure formed during the interaction may exhibit non-monotonicity both in the speed of self-dynamics of the environment as well as its mixedness. The former effect is particularly strong, showing that -- considering part of the environment as a measurement apparatus -- an increase of the external magnetic field acting on the environment may turn the very vague measurement into close to ideal. The above effects suggest that quantum objectivity may appear after increasing the dynamics of the environment, although not with respect to the pointer basis, but some other one which we call generalized pointer or indicator basis. Furthermore, it seems also that when the objectivity is poor it may be improved, at least by some amount, by increasing thermal noise. We provide further evidence of that by analyzing the upper bounds on distance to the set of states representing perfect objectivity in the case of a higher number of qubits.