= Photonic Bell test with efficient detection and random settings
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In 2015, <Marissa Giustina>, <Anton Zeilinger> and collaborators combined <spontaneous parametric down-conversion> with rapid random analyzer choices and efficient <transition-edge sensors>. Local records included settings and detector signals; their <Bell inequality> used detected and undetected trials, avoiding <fair sampling>. Locally fixed time slots prevented coincidence-based trial selection. Calibrated optical and electrical delays checked <spacelike separation> of each choice from the remote readout. The violation addressed detection and locality together. <Measurement independence> still requires assumptions about the hidden state's origin; the experiment cannot exclude every possible common cause of source and settings.<Significant-loophole-free test of Bell's theorem with entangled photons by Marissa Giustina and others>[Version 2, pp. 1-4, Figs. 1-2 and Eq. (1)]{ref}
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