Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres

By B. Hensen, Hannes Bernien, A. Dréau, A. Reiserer, N. Kalb, M. Blok, J. Ruitenberg, R. Vermeulen, R. Schouten, C. Abellán and 9 more. Nature, 2015

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Quantum metrology with nonclassical states of atomic ensembles (2016, background): “…in systems of at most a few (usually two) particles (Aspect et al., 1982; Eibl et al., 2003; Freedman and Clauser, 1972; Giustina et al., 2015; Hensen et al., 2015; Hofmann et al., 2012; Lanyon et al., 2014; Matsukevich et al., 2008; Rosenfeld et al., 2017; Shalm et al., 2015; Zhao et al.,…”
A link layer protocol for quantum networks (2019, methodology): “3 km, which has been achieved using a solid state platform known as Nitrogen-Vacancy (NV) centers in diamond [44].”
Entanglement certification from theory to experiment (2018, background): “Today, the study of Bell-like inequalities is an active field of research [16], culminating in recent experimental tests closing all loopholes [17–19].”