{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"bbd664b7728e5a529f4432c3121070c30737e87e156baf92e4fcec806cce58a7","created":"2026-10-03T07:17:52Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"fa94b6812d7c46c3060df638f70647a77b516c93f2b75b0ade5510e7288fdcd0","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"qi.gravity-quantum","field":"qi","n":"1","review_cite":"Bose et al., Spin entanglement witness for quantum gravity, Physical Review Letters, 2017","review_link":"https://doi.org/10.1103/PhysRevLett.119.240401","review_verified":"true","summary":"Every other force is known to obey quantum rules, but gravity is too weak to test directly. Tabletop experiments aim to see whether gravity between two tiny masses can create entanglement (linked quantum states), which a classical field is argued not to do.","title":"Laboratory tests of whether gravity is quantum","topic_ref":null,"why":"It is the most direct experimental route to deciding whether spacetime must be quantized."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"101461c166891c74d153ef2ee42bdf128bf11de35d6dfcf854295b5e7dfab008","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"b49f499a765fb6ba74a29bea69e85b2631453c3f49ff94f148a1a43322619894","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"DeN8QSKqQMnsJAMvBh0_ndxKDzMUUNuuGeSE3Jp22EXjHSYCdVhIrGbUTsI4eUJhFBsHR6FFG9lNpjYZ9BLiDQ"},"schema":"pubphys.envelope/1"},"record_hash":"101461c166891c74d153ef2ee42bdf128bf11de35d6dfcf854295b5e7dfab008","leaf_index":334}