{"slug":"quantum-foundations","topic":"quantum-foundations","title":"Quantum Foundations: State of the Field (October 2026)","summary":"This dossier surveys quantum foundations as of October 2026: loophole-free Bell tests, contextuality, extended Wigner's friend arguments and experimental bounds on spontaneous collapse models. The main takeaway is that nonlocality is well established under loophole-free conditions, while the measurement problem and the status of collapse models remain open.","version":1,"published_at":"2026-10-30","updated_at":"2026-10-30","stats":{"words":3333,"citations":42,"claims":28,"timeline":15,"benchmarks":9,"open_problems":5,"key_papers":15,"glossary":13},"verification":{"status":"verified","method":"independent AI fact-check against cited sources (evidence pack + web checks); automated citation resolution","claims_checked":28,"issues_fixed":21,"verified_at":"2026-10-30"},"ai_assisted":true,"price":{"usd":"0.20","protocol":"x402","network":"eip155:84532","asset":"USDC"},"url":"https://space-kitty.com/dossiers/quantum-foundations","preview_url":"https://space-kitty.com/api/v1/dossiers/quantum-foundations/preview","purchase_url":"https://space-kitty.com/api/v1/dossiers/quantum-foundations","toc":[{"level":2,"text":"Executive summary","anchor":"executive-summary"},{"level":2,"text":"Background and core concepts","anchor":"background-and-core-concepts"},{"level":2,"text":"Timeline of key milestones","anchor":"timeline-of-key-milestones"},{"level":2,"text":"State of the art","anchor":"state-of-the-art"},{"level":3,"text":"Loophole-free Bell tests","anchor":"loophole-free-bell-tests"},{"level":3,"text":"Device-independent applications","anchor":"device-independent-applications"},{"level":3,"text":"Contextuality and nonlocality","anchor":"contextuality-and-nonlocality"},{"level":3,"text":"Extended Wigner's friend arguments","anchor":"extended-wigner-s-friend-arguments"},{"level":3,"text":"Collapse models and experimental bounds","anchor":"collapse-models-and-experimental-bounds"},{"level":3,"text":"Quantitative benchmarks","anchor":"quantitative-benchmarks"},{"level":2,"text":"Open problems and active debates","anchor":"open-problems-and-active-debates"},{"level":2,"text":"Major programs and players","anchor":"major-programs-and-players"},{"level":2,"text":"Outlook: what to watch (next 12-18 months)","anchor":"outlook-what-to-watch-next-12-18-months"},{"level":2,"text":"Key papers","anchor":"key-papers"},{"level":2,"text":"Glossary","anchor":"glossary"}],"sample_claims":["Hensen et al. reported a loophole-free Bell violation using entangled electron spins in diamond separated by 1.3 km; a 2016 paper describes this as the first loophole-free evidence against local-realist theories.","In 2015, one photonic test was reported as strong loophole-free (Shalm et al., with all relevant events spacelike separated) and another as significant-loophole-free (Giustina et al.), both violating local realism."],"includes":["markdown","claims","timeline","benchmarks","open_problems","key_papers","glossary","bibliography"],"citation_count":42,"how_to_buy":"GET https://space-kitty.com/api/v1/dossiers/quantum-foundations with an x402 client ($0.20, USDC on Base Sepolia (testnet))."}