In recent years, examining the information processing aspects of nature has received significant attention. In particular, entanglement has been shown to exhibit what is arguably the most distinctive and unique aspect of quantum information science. In this note, a numerical method is applied to the Bell inequalities for examining the range of nonlocality when imperfect measurements are performed at each end. A two-qubit direct protocol is also examined such that, unlike the Bell-type inequalities, the approach is not as stable as the indirect one against measurement errors in yielding the nonlocality. On the other hand, since many applications of quantum technology involve a particular type of entanglement, it is important to have a technique to manipulate correlations. In this paper, five chained 2-level entanglements are also examined with swapping protocols applied at each joint. It is numerically shown that there exists a class of states that approximate the optimal result, i.e., the weakest link.

Data, Numerical Methods, Entanglement, Nonlocality