{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:3TUPTVRWBYFCJNU7OMMRSDHXH6","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"ad3aec980834d9910dceb0b4320682128420039a8e475bb9e9404e4b8b393b71","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-02-02T13:28:53Z","title_canon_sha256":"d00d34c7e39827cb41a90eb4cf94a748f8f79d3343ec8473a257a4c558ec4387"},"schema_version":"1.0","source":{"id":"1502.00470","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.00470","created_at":"2026-05-18T02:28:05Z"},{"alias_kind":"arxiv_version","alias_value":"1502.00470v1","created_at":"2026-05-18T02:28:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.00470","created_at":"2026-05-18T02:28:05Z"},{"alias_kind":"pith_short_12","alias_value":"3TUPTVRWBYFC","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"3TUPTVRWBYFCJNU7","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"3TUPTVRW","created_at":"2026-05-18T12:29:02Z"}],"graph_snapshots":[{"event_id":"sha256:e64828c58ab04c8babf6f12dc802401cafb88f166a3ae7ffa6741e07c411fa5f","target":"graph","created_at":"2026-05-18T02:28:05Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Ultracold atoms in an ultrahigh-finesse optical cavity are a powerful platform to produce spin squeezing since photon of cavity mode can induce nonlinear spin-spin interaction and thus generate a one-axis twisting Hamiltonian $H_{\\text{OAT}}=qJ_{x}^{2}$, whose corresponding maximal squeezing factor scales as $N^{-2/3}$, where $N$ is the atomic number. On the contrary, for the other two-axis twisting Hamiltonian $H_{\\text{TAT}}=q(J_{x}^{2}-J_{y}^{2})$, the maximal squeezing factor scales as $N^{-1}$, approaching the Heisenberg limit. In this paper, inspired by recent experiments of cavity-assis","authors_text":"Caifeng Li, Gang Chen, Jingtao Fan, Lixuan Yu, Suotang Jia, Tian-Cai Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-02-02T13:28:53Z","title":"Two-axis spin squeezing in two cavities"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.00470","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:257b96759894be4468265d5cf9ccdedfc884225ebc6bc3f2d3281f367c6e7b06","target":"record","created_at":"2026-05-18T02:28:05Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"ad3aec980834d9910dceb0b4320682128420039a8e475bb9e9404e4b8b393b71","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-02-02T13:28:53Z","title_canon_sha256":"d00d34c7e39827cb41a90eb4cf94a748f8f79d3343ec8473a257a4c558ec4387"},"schema_version":"1.0","source":{"id":"1502.00470","kind":"arxiv","version":1}},"canonical_sha256":"dce8f9d6360e0a24b69f7319190cf73fabc6313c0a1c60b7a9234f9e307fd6c7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dce8f9d6360e0a24b69f7319190cf73fabc6313c0a1c60b7a9234f9e307fd6c7","first_computed_at":"2026-05-18T02:28:05.958679Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:28:05.958679Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sTCjIlX5IjqL/2PCajqmgYKRDWG9EgpjUKOhUUNP0H4VxhHKwmY/wMDrpk/7rBx73P2bd28PsuyLpRKwURlFCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:28:05.959027Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.00470","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:257b96759894be4468265d5cf9ccdedfc884225ebc6bc3f2d3281f367c6e7b06","sha256:e64828c58ab04c8babf6f12dc802401cafb88f166a3ae7ffa6741e07c411fa5f"],"state_sha256":"b35d2d7c804bc9aa8711cd9a1b86a71ba23972d14f458e0835fbb71feec403b7"}