  Hardy's paradox provides an all-versus-nothing fashion to directly certify
that quantum mechanics cannot be completely described by local realistic
theory. However, when considering potential imperfections in experiments, like
imperfect entanglement source and low detection efficiency, the original
Hardy's paradox may induce a rather small Hardy violation and only be realized
by expensive quantum systems. To overcome this problem, we propose a realigned
Hardy's paradox. Compared with the original version of Hardy's paradox, the
realigned Hardy's paradox can dramatically improve the Hardy violation. Then,
we generalize the realigned Hardy's paradox to arbitrary even $n$ dichotomic
measurements. For $n=2$ and $n=4$ cases, the realigned Hardy's paradox can
achieve Hardy values $P(00|A_1B_1)$ approximate $0.4140$ and $0.7734$
respectively compared with $0.09$ of the original Hardy's paradox. Meanwhile,
the structure of the realigned Hardy's paradox is simpler and more robust in
the sense that there is only one Hardy condition rather than three conditions.
One can anticipate that the realigned Hardy's paradox can tolerate more
experimental imperfections and stimulate more fascinating quantum information
applications.
