Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres (SRC-HENSEN-2015)

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

Hensen, B.; et al. · 2015

AI-verified citationSRC-HENSEN-2015

identifier / locator

Nature 526: 682–686. DOI: 10.1038/nature15759

url

verification note

arXiv record and journal reference confirmed 2026-08-22; abstract read (CHSH S = 2.42 ± 0.20, 245 trials).

reliability notes

The first loophole-free Bell test; the minimum benchmark any claimed emergence of quantum nonlocality must reproduce.

Evidence drawn from this source

Supports· strongZW-E017

what the source states: Entangled electron spins separated by 1.3 km violated the CHSH inequality loophole-free: S = 2.42 ± 0.20 over 245 trials, against the local-realist bound S ≤ 2 and below the quantum (Tsirelson) bound of 2√2.
what we infer: Fixes the empirical target with a number. Any observer-first derivation must yield correlations that exceed 2 and cap at 2√2 — exceeding 2 alone would only establish generic nonclassicality, which no-signalling boxes also achieve. The gap between those two requirements is where most "we get nonlocality" claims quietly live.
limitations: None material for its role here as benchmark; later Bell tests have strengthened the result.