无序反射下分离时间量子行走的纠缠特性研究

摘要

文章以一维有限长格点线上的分离时间量子行走为对象,考虑反射边界效应,并通过静态和动态两种方式随机地断开相邻格点间的连接边引入无序效应,研究了局域和非局域两种不同初态下,无序效应对量子行走位置自由度和硬币自由度之间纠缠的影响.对于非局域初态,静态无序和动态无序都能够增强纠缠,而对于局域初态,只有动态无序可以增强纠缠.不管无序强度多大,动态无序都会使得纠缠在长时间极限下趋于最大纠缠.%We consider the discrete-time quantum walk on one-dimensional finite lattices with reflecting boundary and introduce static and dynamical disorders by breaking the links randomly.The effects of disorder on the dynamical entanglement between the coin degree of freedom and position degree of freedom are investigated for local and non-local initial states,respectively.Both static and dynamical disorders can enhance the entanglement for non-local initial state,while only dynamical disorder can do for local initial state.Moreover,the dynamical disorder can produce maximum entanglement at long time limit regardless of the strength of disorder.