{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:NLAEQVDADI424UAWIMGUXOCRG4","short_pith_number":"pith:NLAEQVDA","schema_version":"1.0","canonical_sha256":"6ac04854601a39ae5016430d4bb851372051989bcbc9ae8d4cd25a7a16c47cf7","source":{"kind":"arxiv","id":"1905.09707","version":2},"attestation_state":"computed","paper":{"title":"Accuracy enhancing protocols for quantum clocks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Lennart Baumg\\\"artner, Ralph Silva, Renato Renner, Yuxiang Yang","submitted_at":"2019-05-23T15:12:13Z","abstract_excerpt":"The accuracy of the time information generated by clocks can be enhanced by allowing them to communicate with each other. Here we consider a basic scenario where a quantum clock receives a low-accuracy time signal as input and ask whether it can generate an output of higher accuracy. We propose protocols that use a quantum clock with a $d$-dimensional state space to achieve an accuracy enhancement by a factor of $d$, for large enough $d$. If no feedback to the input signal is allowed, this enhancement is temporary. With feedback the accuracy enhancement can be retained indefinitely. Our protoc"},"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":"1905.09707","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-05-23T15:12:13Z","cross_cats_sorted":[],"title_canon_sha256":"deaa9f18e748b5709de3a27949cf7ddf62bd2b253bc095acb7edfc308296be99","abstract_canon_sha256":"9f11ae442b694061a7b190f38263511fcdf6197c62755fb538319f6b4dce5cfa"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:23:22.396822Z","signature_b64":"3cJyUTe/FXdOs8JKXiA7twDCAEEOQ5K7jVMhlDvvox15scHDhPctOt1N5q3uln5UZm2Dz+xeFrluFrwDzbUvDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6ac04854601a39ae5016430d4bb851372051989bcbc9ae8d4cd25a7a16c47cf7","last_reissued_at":"2026-07-05T00:23:22.396389Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:23:22.396389Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Accuracy enhancing protocols for quantum clocks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Lennart Baumg\\\"artner, Ralph Silva, Renato Renner, Yuxiang Yang","submitted_at":"2019-05-23T15:12:13Z","abstract_excerpt":"The accuracy of the time information generated by clocks can be enhanced by allowing them to communicate with each other. Here we consider a basic scenario where a quantum clock receives a low-accuracy time signal as input and ask whether it can generate an output of higher accuracy. We propose protocols that use a quantum clock with a $d$-dimensional state space to achieve an accuracy enhancement by a factor of $d$, for large enough $d$. If no feedback to the input signal is allowed, this enhancement is temporary. With feedback the accuracy enhancement can be retained indefinitely. Our protoc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.09707","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1905.09707/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"1905.09707","created_at":"2026-07-05T00:23:22.396452+00:00"},{"alias_kind":"arxiv_version","alias_value":"1905.09707v2","created_at":"2026-07-05T00:23:22.396452+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.09707","created_at":"2026-07-05T00:23:22.396452+00:00"},{"alias_kind":"pith_short_12","alias_value":"NLAEQVDADI42","created_at":"2026-07-05T00:23:22.396452+00:00"},{"alias_kind":"pith_short_16","alias_value":"NLAEQVDADI424UAW","created_at":"2026-07-05T00:23:22.396452+00:00"},{"alias_kind":"pith_short_8","alias_value":"NLAEQVDA","created_at":"2026-07-05T00:23:22.396452+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/NLAEQVDADI424UAWIMGUXOCRG4","json":"https://pith.science/pith/NLAEQVDADI424UAWIMGUXOCRG4.json","graph_json":"https://pith.science/api/pith-number/NLAEQVDADI424UAWIMGUXOCRG4/graph.json","events_json":"https://pith.science/api/pith-number/NLAEQVDADI424UAWIMGUXOCRG4/events.json","paper":"https://pith.science/paper/NLAEQVDA"},"agent_actions":{"view_html":"https://pith.science/pith/NLAEQVDADI424UAWIMGUXOCRG4","download_json":"https://pith.science/pith/NLAEQVDADI424UAWIMGUXOCRG4.json","view_paper":"https://pith.science/paper/NLAEQVDA","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1905.09707&json=true","fetch_graph":"https://pith.science/api/pith-number/NLAEQVDADI424UAWIMGUXOCRG4/graph.json","fetch_events":"https://pith.science/api/pith-number/NLAEQVDADI424UAWIMGUXOCRG4/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/NLAEQVDADI424UAWIMGUXOCRG4/action/timestamp_anchor","attest_storage":"https://pith.science/pith/NLAEQVDADI424UAWIMGUXOCRG4/action/storage_attestation","attest_author":"https://pith.science/pith/NLAEQVDADI424UAWIMGUXOCRG4/action/author_attestation","sign_citation":"https://pith.science/pith/NLAEQVDADI424UAWIMGUXOCRG4/action/citation_signature","submit_replication":"https://pith.science/pith/NLAEQVDADI424UAWIMGUXOCRG4/action/replication_record"}},"created_at":"2026-07-05T00:23:22.396452+00:00","updated_at":"2026-07-05T00:23:22.396452+00:00"}