{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:L6CRQZRV2AMRNO7BFDYQJZGG3H","short_pith_number":"pith:L6CRQZRV","schema_version":"1.0","canonical_sha256":"5f85186635d01916bbe128f104e4c6d9fe5a2e9176cee1c1585ce71cf05f9230","source":{"kind":"arxiv","id":"1703.02439","version":1},"attestation_state":"computed","paper":{"title":"Vacuum spin squeezing","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph"],"primary_cat":"quant-ph","authors_text":"Alban Urvoy, Boris Braverman, Jiazhong Hu, Vladan Vuleti\\'c, Wenlan Chen, Zachary Vendeiro","submitted_at":"2017-03-07T15:41:49Z","abstract_excerpt":"We investigate the generation of entanglement (spin squeezing) in an optical-transition atomic clock through the coupling to a vacuum electromagnetic field that is enhanced by an optical cavity. We show that if each atom is prepared in a superposition of the ground state and a long-lived electronic excited state, and viewed as a spin-1/2 system, then the collective vacuum light shift entangles the atoms, resulting in a squeezed distribution of the ensemble collective spin. This scheme reveals that even a vacuum field can be a useful resource for entanglement and quantum manipulation. The metho"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1703.02439","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-03-07T15:41:49Z","cross_cats_sorted":["physics.atom-ph"],"title_canon_sha256":"8dba54a557aec7944dbed997dc9bcf37c9dfcc0df68e19456cbd078323009ae0","abstract_canon_sha256":"b84711462f21a15352914100a00349932821acb9b4fe6a50cdf95f2cd6136580"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:30:05.419011Z","signature_b64":"SAabFWjC4L5FX8bzX52pwDpHUYOb4X1qWMi5MnXMUbZ6HsWw2M2F7JvLSxYWUjbm1q7Fgfii42zEsGJgqcREAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5f85186635d01916bbe128f104e4c6d9fe5a2e9176cee1c1585ce71cf05f9230","last_reissued_at":"2026-05-18T00:30:05.418488Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:30:05.418488Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Vacuum spin squeezing","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph"],"primary_cat":"quant-ph","authors_text":"Alban Urvoy, Boris Braverman, Jiazhong Hu, Vladan Vuleti\\'c, Wenlan Chen, Zachary Vendeiro","submitted_at":"2017-03-07T15:41:49Z","abstract_excerpt":"We investigate the generation of entanglement (spin squeezing) in an optical-transition atomic clock through the coupling to a vacuum electromagnetic field that is enhanced by an optical cavity. We show that if each atom is prepared in a superposition of the ground state and a long-lived electronic excited state, and viewed as a spin-1/2 system, then the collective vacuum light shift entangles the atoms, resulting in a squeezed distribution of the ensemble collective spin. This scheme reveals that even a vacuum field can be a useful resource for entanglement and quantum manipulation. The metho"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.02439","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1703.02439","created_at":"2026-05-18T00:30:05.418566+00:00"},{"alias_kind":"arxiv_version","alias_value":"1703.02439v1","created_at":"2026-05-18T00:30:05.418566+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.02439","created_at":"2026-05-18T00:30:05.418566+00:00"},{"alias_kind":"pith_short_12","alias_value":"L6CRQZRV2AMR","created_at":"2026-05-18T12:31:28.150371+00:00"},{"alias_kind":"pith_short_16","alias_value":"L6CRQZRV2AMRNO7B","created_at":"2026-05-18T12:31:28.150371+00:00"},{"alias_kind":"pith_short_8","alias_value":"L6CRQZRV","created_at":"2026-05-18T12:31:28.150371+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/L6CRQZRV2AMRNO7BFDYQJZGG3H","json":"https://pith.science/pith/L6CRQZRV2AMRNO7BFDYQJZGG3H.json","graph_json":"https://pith.science/api/pith-number/L6CRQZRV2AMRNO7BFDYQJZGG3H/graph.json","events_json":"https://pith.science/api/pith-number/L6CRQZRV2AMRNO7BFDYQJZGG3H/events.json","paper":"https://pith.science/paper/L6CRQZRV"},"agent_actions":{"view_html":"https://pith.science/pith/L6CRQZRV2AMRNO7BFDYQJZGG3H","download_json":"https://pith.science/pith/L6CRQZRV2AMRNO7BFDYQJZGG3H.json","view_paper":"https://pith.science/paper/L6CRQZRV","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1703.02439&json=true","fetch_graph":"https://pith.science/api/pith-number/L6CRQZRV2AMRNO7BFDYQJZGG3H/graph.json","fetch_events":"https://pith.science/api/pith-number/L6CRQZRV2AMRNO7BFDYQJZGG3H/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/L6CRQZRV2AMRNO7BFDYQJZGG3H/action/timestamp_anchor","attest_storage":"https://pith.science/pith/L6CRQZRV2AMRNO7BFDYQJZGG3H/action/storage_attestation","attest_author":"https://pith.science/pith/L6CRQZRV2AMRNO7BFDYQJZGG3H/action/author_attestation","sign_citation":"https://pith.science/pith/L6CRQZRV2AMRNO7BFDYQJZGG3H/action/citation_signature","submit_replication":"https://pith.science/pith/L6CRQZRV2AMRNO7BFDYQJZGG3H/action/replication_record"}},"created_at":"2026-05-18T00:30:05.418566+00:00","updated_at":"2026-05-18T00:30:05.418566+00:00"}