{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2016:4JPWZ3Q56VT6YJQFDMEA2DKLM7","short_pith_number":"pith:4JPWZ3Q5","schema_version":"1.0","canonical_sha256":"e25f6cee1df567ec26051b080d0d4b67eb55f62b53aa23d2b1f3a38b8fdb8b15","source":{"kind":"arxiv","id":"1605.07754","version":1},"attestation_state":"computed","paper":{"title":"0.75 atoms improve the clock signal of 10,000 atoms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.quant-gas"],"primary_cat":"quant-ph","authors_text":"A. Smerzi, B. L\\\"ucke, C. Klempt, C. Lisdat, I. Kruse, J. Arlt, J. Peise, K. Lange, L. Pezz\\`e, L. Santos, W. Ertmer","submitted_at":"2016-05-25T06:55:36Z","abstract_excerpt":"Since the pioneering work of Ramsey, atom interferometers are employed for precision metrology, in particular to measure time and to realize the second. In a classical interferometer, an ensemble of atoms is prepared in one of the two input states, whereas the second one is left empty. In this case, the vacuum noise restricts the precision of the interferometer to the standard quantum limit (SQL). Here, we propose and experimentally demonstrate a novel clock configuration that surpasses the SQL by squeezing the vacuum in the empty input state. We create a squeezed vacuum state containing an av"},"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":"1605.07754","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2016-05-25T06:55:36Z","cross_cats_sorted":["cond-mat.quant-gas"],"title_canon_sha256":"4243c50bbe213aa5ed9e0e5f85acf23a2e3fcd78be7b26930b35dcb45da39e36","abstract_canon_sha256":"aba27e24db80a6031db8757e6c9010e05896f8b1c658bb385fb5d585247c7388"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:03:18.867945Z","signature_b64":"SM4pCHtDHryKgsSv6r39yXNnfZYfoV/GDERocoGnyXaefSEQce+aNogoCo32Yj9HGN76PFocAXZoM+PgSUBeAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e25f6cee1df567ec26051b080d0d4b67eb55f62b53aa23d2b1f3a38b8fdb8b15","last_reissued_at":"2026-05-18T01:03:18.867512Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:03:18.867512Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"0.75 atoms improve the clock signal of 10,000 atoms","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.quant-gas"],"primary_cat":"quant-ph","authors_text":"A. Smerzi, B. L\\\"ucke, C. Klempt, C. Lisdat, I. Kruse, J. Arlt, J. Peise, K. Lange, L. Pezz\\`e, L. Santos, W. Ertmer","submitted_at":"2016-05-25T06:55:36Z","abstract_excerpt":"Since the pioneering work of Ramsey, atom interferometers are employed for precision metrology, in particular to measure time and to realize the second. In a classical interferometer, an ensemble of atoms is prepared in one of the two input states, whereas the second one is left empty. In this case, the vacuum noise restricts the precision of the interferometer to the standard quantum limit (SQL). Here, we propose and experimentally demonstrate a novel clock configuration that surpasses the SQL by squeezing the vacuum in the empty input state. We create a squeezed vacuum state containing an av"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.07754","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":"1605.07754","created_at":"2026-05-18T01:03:18.867575+00:00"},{"alias_kind":"arxiv_version","alias_value":"1605.07754v1","created_at":"2026-05-18T01:03:18.867575+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.07754","created_at":"2026-05-18T01:03:18.867575+00:00"},{"alias_kind":"pith_short_12","alias_value":"4JPWZ3Q56VT6","created_at":"2026-05-18T12:29:58.707656+00:00"},{"alias_kind":"pith_short_16","alias_value":"4JPWZ3Q56VT6YJQF","created_at":"2026-05-18T12:29:58.707656+00:00"},{"alias_kind":"pith_short_8","alias_value":"4JPWZ3Q5","created_at":"2026-05-18T12:29:58.707656+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2604.11635","citing_title":"Robust quantum metrology using disordered probes","ref_index":81,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/4JPWZ3Q56VT6YJQFDMEA2DKLM7","json":"https://pith.science/pith/4JPWZ3Q56VT6YJQFDMEA2DKLM7.json","graph_json":"https://pith.science/api/pith-number/4JPWZ3Q56VT6YJQFDMEA2DKLM7/graph.json","events_json":"https://pith.science/api/pith-number/4JPWZ3Q56VT6YJQFDMEA2DKLM7/events.json","paper":"https://pith.science/paper/4JPWZ3Q5"},"agent_actions":{"view_html":"https://pith.science/pith/4JPWZ3Q56VT6YJQFDMEA2DKLM7","download_json":"https://pith.science/pith/4JPWZ3Q56VT6YJQFDMEA2DKLM7.json","view_paper":"https://pith.science/paper/4JPWZ3Q5","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1605.07754&json=true","fetch_graph":"https://pith.science/api/pith-number/4JPWZ3Q56VT6YJQFDMEA2DKLM7/graph.json","fetch_events":"https://pith.science/api/pith-number/4JPWZ3Q56VT6YJQFDMEA2DKLM7/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/4JPWZ3Q56VT6YJQFDMEA2DKLM7/action/timestamp_anchor","attest_storage":"https://pith.science/pith/4JPWZ3Q56VT6YJQFDMEA2DKLM7/action/storage_attestation","attest_author":"https://pith.science/pith/4JPWZ3Q56VT6YJQFDMEA2DKLM7/action/author_attestation","sign_citation":"https://pith.science/pith/4JPWZ3Q56VT6YJQFDMEA2DKLM7/action/citation_signature","submit_replication":"https://pith.science/pith/4JPWZ3Q56VT6YJQFDMEA2DKLM7/action/replication_record"}},"created_at":"2026-05-18T01:03:18.867575+00:00","updated_at":"2026-05-18T01:03:18.867575+00:00"}