{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2012:7JWMMCW53OFBF24SLUMV3ZR7TX","short_pith_number":"pith:7JWMMCW5","schema_version":"1.0","canonical_sha256":"fa6cc60adddb8a12eb925d195de63f9dd1a53b0b76da7636f512a13aa4f8be86","source":{"kind":"arxiv","id":"1211.3570","version":1},"attestation_state":"computed","paper":{"title":"Quantum-Dense Metrology","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Helge M\\\"uller-Ebhardt, J\\\"oran Bauchrowitz, Karsten Danzmann, Melanie Meinders, Roman Schnabel, Sebastian Steinlechner","submitted_at":"2012-11-15T10:50:23Z","abstract_excerpt":"Quantum metrology utilizes entanglement for improving the sensitivity of measurements. Up to now the focus has been on the measurement of just one out of two non-commuting observables. Here we demonstrate a laser interferometer that provides information about two non-commuting observables, with uncertainties below that of the meter's quantum ground state. Our experiment is a proof-of-principle of quantum dense metrology, and uses the additional information to distinguish between the actual phase signal and a parasitic signal due to scattered and frequency shifted photons. Our approach can be r"},"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":"1211.3570","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-11-15T10:50:23Z","cross_cats_sorted":[],"title_canon_sha256":"a14a12fae555404bd6287611e47181be343b1e2590a3390ef71f83b3fb984954","abstract_canon_sha256":"69d99f740087d2d3064bdaa208ec69f032ec729d80a67ad10b705aa9450463ca"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:40:39.390442Z","signature_b64":"6gWHfWkec0iO1L9uNOv2y09rktuPEzCa2GqZF7J1efmwAXKgGwMds5BAildGtVf4yt7gHuTlkXlZTHWo8XkEAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fa6cc60adddb8a12eb925d195de63f9dd1a53b0b76da7636f512a13aa4f8be86","last_reissued_at":"2026-05-18T03:40:39.389791Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:40:39.389791Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Quantum-Dense Metrology","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Helge M\\\"uller-Ebhardt, J\\\"oran Bauchrowitz, Karsten Danzmann, Melanie Meinders, Roman Schnabel, Sebastian Steinlechner","submitted_at":"2012-11-15T10:50:23Z","abstract_excerpt":"Quantum metrology utilizes entanglement for improving the sensitivity of measurements. Up to now the focus has been on the measurement of just one out of two non-commuting observables. Here we demonstrate a laser interferometer that provides information about two non-commuting observables, with uncertainties below that of the meter's quantum ground state. Our experiment is a proof-of-principle of quantum dense metrology, and uses the additional information to distinguish between the actual phase signal and a parasitic signal due to scattered and frequency shifted photons. Our approach can be r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.3570","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":"1211.3570","created_at":"2026-05-18T03:40:39.389897+00:00"},{"alias_kind":"arxiv_version","alias_value":"1211.3570v1","created_at":"2026-05-18T03:40:39.389897+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1211.3570","created_at":"2026-05-18T03:40:39.389897+00:00"},{"alias_kind":"pith_short_12","alias_value":"7JWMMCW53OFB","created_at":"2026-05-18T12:26:58.693483+00:00"},{"alias_kind":"pith_short_16","alias_value":"7JWMMCW53OFBF24S","created_at":"2026-05-18T12:26:58.693483+00:00"},{"alias_kind":"pith_short_8","alias_value":"7JWMMCW5","created_at":"2026-05-18T12:26:58.693483+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/7JWMMCW53OFBF24SLUMV3ZR7TX","json":"https://pith.science/pith/7JWMMCW53OFBF24SLUMV3ZR7TX.json","graph_json":"https://pith.science/api/pith-number/7JWMMCW53OFBF24SLUMV3ZR7TX/graph.json","events_json":"https://pith.science/api/pith-number/7JWMMCW53OFBF24SLUMV3ZR7TX/events.json","paper":"https://pith.science/paper/7JWMMCW5"},"agent_actions":{"view_html":"https://pith.science/pith/7JWMMCW53OFBF24SLUMV3ZR7TX","download_json":"https://pith.science/pith/7JWMMCW53OFBF24SLUMV3ZR7TX.json","view_paper":"https://pith.science/paper/7JWMMCW5","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1211.3570&json=true","fetch_graph":"https://pith.science/api/pith-number/7JWMMCW53OFBF24SLUMV3ZR7TX/graph.json","fetch_events":"https://pith.science/api/pith-number/7JWMMCW53OFBF24SLUMV3ZR7TX/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/7JWMMCW53OFBF24SLUMV3ZR7TX/action/timestamp_anchor","attest_storage":"https://pith.science/pith/7JWMMCW53OFBF24SLUMV3ZR7TX/action/storage_attestation","attest_author":"https://pith.science/pith/7JWMMCW53OFBF24SLUMV3ZR7TX/action/author_attestation","sign_citation":"https://pith.science/pith/7JWMMCW53OFBF24SLUMV3ZR7TX/action/citation_signature","submit_replication":"https://pith.science/pith/7JWMMCW53OFBF24SLUMV3ZR7TX/action/replication_record"}},"created_at":"2026-05-18T03:40:39.389897+00:00","updated_at":"2026-05-18T03:40:39.389897+00:00"}