通过设计量子库来调控量子比特间的Bell非定域性研究

量子系统间的Bell非定域性是一种比量子纠缠更为严格的量子关联，它在刻画多体量子关联有着不可或缺的作用.类似于量子纠缠，在开放两量子比特和三量子比特系统中的Bell非定域性可能会出现猝死现象.本文建议了一个可供选择的方案即在热库环境中通过增加辅助粒子来调控两量子比特和三量子比特间的Bell非定域性动力学.研究发现：通过调节辅助粒子数目，不仅两量子比特和三量子比特系统的Bell非定域性可以避免猝死现象的发生，而且在长时间极限下它能维持在一个较高水平.论文得到的结果将对多体量子系统间量子关联的调控和避免猝死现象等相关研究有积极的指导意义.

Manipulating Bell-nonlocality of multi-qubit systems via quantum reservoir engineering

Bell nonlocality as a more rigorous quantum correlation than quantum entanglement by violating Bell-type inequality becomes a powerful tool in indirectly characterizing quantum entanglement in multipartite systems. Similar to quantum entanglement, the Bell nonlocalities in open two-qubit and three-qubit systems may lead to sudden death phenomenon. In this paper, we suggest an alternative scheme to manipulate the dynamical evolution of Bell nonlocalities of two-qubit and three-qubit systems under independent generalized amplitude damping models. By investigation, it is found that the Bell nonlocality dynamics in two-qubit and three-qubit systems can be obviously affected by adjusting the number of auxiliary particles in the reservoir.Concretely speaking, the Bell nonlocalities sudden death for two-qubit and three-qubit systems can be effectively avoided by controlling the auxiliary particles, and the amount of Bell nonlocality can arrive a high level in the long time limit. The results obtained in this paper may be positive guiding significance for the regulation of quantum correlation in multi-body quantum systems and the avoidance of sudden death.