  One of the most striking features of quantum theory is that it allows distant
observers to share correlations that resist local hidden variable (classical)
explanations, a phenomenon referred to as Bell nonlocality. Besides their
foundational relevance, the nonlocal correlations enable distant observers to
accomplish classically inconceivable information processing and cryptographic
feats such as unconditionally secure device-independent key distribution
schemes. However, the distances over which nonlocal correlations can be
realized in state-of-the-art Bell experiments remain severely limited owing to
the high threshold efficiencies of the detectors and the fragility of the
nonlocal correlations to experimental noise. Instead of looking for quantum
strategies with marginally lower threshold requirements, we exploit the
properties of loophole-free nonlocal correlations, which are experimentally
attainable today, albeit at short distances, to extend them over arbitrarily
large distances. Specifically, we consider Bell experiments wherein the
spatially separated parties randomly choose the location of their measurement
devices in addition to their measurement settings. We demonstrate that when
devices close to the source are perfect and witness extremal loophole-free
nonlocal correlations, such correlations can be extended to devices placed
arbitrarily far from the source, with almost-zero detection efficiency and
visibility. To accommodate imperfections close to the source, we demonstrate a
specific analytical tradeoff: the higher the loophole-free nonlocality close to
the source, the lower the threshold requirements away from the source. We
utilize this analytical tradeoff paired with optimal quantum strategies to
estimate the critical requirements of a measurement device placed away from the
source and formulate a versatile numerical method applicable to generic network
scenarios.
