Quantum theory allows spatially separated observers to share nonlocal correlations, which enable them to accomplish classically inconceivable information processing and cryptographic feats. However, the distances over which nonlocal correlations can be realized remain severely limited due to their high fragility to noise and high threshold detection efficiencies. To enable loophole-free nonlocality across large distances, we introduce Bell experiments wherein the spatially separated parties randomly choose the location of their measurement devices. We demonstrate that when devices close to the source are perfect and witness extremal nonlocal correlations, such correlations can be extended to devices placed arbitrarily far from the source. To accommodate imperfections close to the source, we demonstrate an analytic trade-off: the higher the loophole-free nonlocality close to the source, the lower the threshold requirements away from the source. We utilize this trade-off and formulate numerical methods to estimate the critical requirements of individual measurement devices in such experiments.

量子理论允许空间上分离的观察者共享非局域相关性，这使他们能够完成传统上难以想象的信息处理和密码学壮举。然而，由于非局部相关性对噪声的高度脆弱性和高阈值检测效率，可以实现非局部相关性的距离仍然受到严重限制。为了实现远距离的无漏洞非定域性，我们引入了贝尔实验，其中空间上分离的各方随机选择其测量设备的位置。我们证明，当靠近源的设备是完美的并且见证极值非局部相关性时，这种相关性可以扩展到任意远离源的设备。为了适应靠近源的缺陷，我们展示了一种分析权衡：靠近源的无漏洞非局域性越高，远离源的阈值要求越低。我们利用这种权衡并制定数值方法来估计此类实验中各个测量设备的关键要求。