{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:BGEQLLX7I7JPE7HHNG2LJEETCT","short_pith_number":"pith:BGEQLLX7","canonical_record":{"source":{"id":"1203.0288","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-03-01T20:42:34Z","cross_cats_sorted":["physics.atom-ph"],"title_canon_sha256":"32251b471287dfcd146d4c24e1af533f332a5cb0232eb89e98b94f85e2373897","abstract_canon_sha256":"5ceeca34aa74e8e688e3713c0a39b3fd226b8bb6e893f52fc0be6d39c8f04938"},"schema_version":"1.0"},"canonical_sha256":"098905aeff47d2f27ce769b4b4909314f82b6ad4215c3756c06a459a4701efe4","source":{"kind":"arxiv","id":"1203.0288","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.0288","created_at":"2026-05-18T04:00:51Z"},{"alias_kind":"arxiv_version","alias_value":"1203.0288v2","created_at":"2026-05-18T04:00:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.0288","created_at":"2026-05-18T04:00:51Z"},{"alias_kind":"pith_short_12","alias_value":"BGEQLLX7I7JP","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"BGEQLLX7I7JPE7HH","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"BGEQLLX7","created_at":"2026-05-18T12:26:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:BGEQLLX7I7JPE7HHNG2LJEETCT","target":"record","payload":{"canonical_record":{"source":{"id":"1203.0288","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-03-01T20:42:34Z","cross_cats_sorted":["physics.atom-ph"],"title_canon_sha256":"32251b471287dfcd146d4c24e1af533f332a5cb0232eb89e98b94f85e2373897","abstract_canon_sha256":"5ceeca34aa74e8e688e3713c0a39b3fd226b8bb6e893f52fc0be6d39c8f04938"},"schema_version":"1.0"},"canonical_sha256":"098905aeff47d2f27ce769b4b4909314f82b6ad4215c3756c06a459a4701efe4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:00:51.260900Z","signature_b64":"Vs0FiC1gao1oSBmTtD+3W21YSzqexx74MVLboYqwK8bOkxkgnd4uPScQk/iLb7irC6FbawOSx9EzBJh/X3lmBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"098905aeff47d2f27ce769b4b4909314f82b6ad4215c3756c06a459a4701efe4","last_reissued_at":"2026-05-18T04:00:51.260325Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:00:51.260325Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1203.0288","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:00:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RNFCETq9h1dZFBW0IluZ8B09fZ0begHITe1jWQkKq0LjwzwaCKdl55ms0URMqpul+Mhpxww4tu57wVkp1A0CDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T02:22:34.333029Z"},"content_sha256":"bb2cf5e600d692e249aa132c011ad86aed51846b50626448ac9fd5f33a478857","schema_version":"1.0","event_id":"sha256:bb2cf5e600d692e249aa132c011ad86aed51846b50626448ac9fd5f33a478857"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:BGEQLLX7I7JPE7HHNG2LJEETCT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Numerical test of few-qubit clock protocols","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph"],"primary_cat":"quant-ph","authors_text":"Till Rosenband","submitted_at":"2012-03-01T20:42:34Z","abstract_excerpt":"The stability of several clock protocols based on 2 to 20 entangled atoms is evaluated numerically by a simulation that includes the effect of decoherence due to classical oscillator noise. In this context the squeezed states discussed by Andr\\'{e}, S{\\o}rensen and Lukin [PRL 92, 239801 (2004)] offer reduced instability compared to clocks based on Ramsey's protocol with unentangled atoms. When more than 15 atoms are simulated, the protocol of Bu\\v{z}ek, Derka and Massar [PRL 82, 2207 (1999)] has lower instability. A large-scale numerical search for optimal clock protocols with two to eight qub"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.0288","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":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:00:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WIEOpq2FQ6ZmVhZ5XyRdHpPK9/xhduhxS9r1g3jf/rF2wT67aheS8R8uMU+xa4MDP2XfuNJ69i+x5jjNrX1XBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T02:22:34.333675Z"},"content_sha256":"f5f11ca75c093eef03dc64157b03a5fbccfa337b04964fdb6e6c75c6cba55a4a","schema_version":"1.0","event_id":"sha256:f5f11ca75c093eef03dc64157b03a5fbccfa337b04964fdb6e6c75c6cba55a4a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BGEQLLX7I7JPE7HHNG2LJEETCT/bundle.json","state_url":"https://pith.science/pith/BGEQLLX7I7JPE7HHNG2LJEETCT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BGEQLLX7I7JPE7HHNG2LJEETCT/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-12T02:22:34Z","links":{"resolver":"https://pith.science/pith/BGEQLLX7I7JPE7HHNG2LJEETCT","bundle":"https://pith.science/pith/BGEQLLX7I7JPE7HHNG2LJEETCT/bundle.json","state":"https://pith.science/pith/BGEQLLX7I7JPE7HHNG2LJEETCT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BGEQLLX7I7JPE7HHNG2LJEETCT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:BGEQLLX7I7JPE7HHNG2LJEETCT","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":"5ceeca34aa74e8e688e3713c0a39b3fd226b8bb6e893f52fc0be6d39c8f04938","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-03-01T20:42:34Z","title_canon_sha256":"32251b471287dfcd146d4c24e1af533f332a5cb0232eb89e98b94f85e2373897"},"schema_version":"1.0","source":{"id":"1203.0288","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.0288","created_at":"2026-05-18T04:00:51Z"},{"alias_kind":"arxiv_version","alias_value":"1203.0288v2","created_at":"2026-05-18T04:00:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.0288","created_at":"2026-05-18T04:00:51Z"},{"alias_kind":"pith_short_12","alias_value":"BGEQLLX7I7JP","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"BGEQLLX7I7JPE7HH","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"BGEQLLX7","created_at":"2026-05-18T12:26:58Z"}],"graph_snapshots":[{"event_id":"sha256:f5f11ca75c093eef03dc64157b03a5fbccfa337b04964fdb6e6c75c6cba55a4a","target":"graph","created_at":"2026-05-18T04:00:51Z","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":"The stability of several clock protocols based on 2 to 20 entangled atoms is evaluated numerically by a simulation that includes the effect of decoherence due to classical oscillator noise. In this context the squeezed states discussed by Andr\\'{e}, S{\\o}rensen and Lukin [PRL 92, 239801 (2004)] offer reduced instability compared to clocks based on Ramsey's protocol with unentangled atoms. When more than 15 atoms are simulated, the protocol of Bu\\v{z}ek, Derka and Massar [PRL 82, 2207 (1999)] has lower instability. A large-scale numerical search for optimal clock protocols with two to eight qub","authors_text":"Till Rosenband","cross_cats":["physics.atom-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-03-01T20:42:34Z","title":"Numerical test of few-qubit clock protocols"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.0288","kind":"arxiv","version":2},"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:bb2cf5e600d692e249aa132c011ad86aed51846b50626448ac9fd5f33a478857","target":"record","created_at":"2026-05-18T04:00:51Z","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":"5ceeca34aa74e8e688e3713c0a39b3fd226b8bb6e893f52fc0be6d39c8f04938","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-03-01T20:42:34Z","title_canon_sha256":"32251b471287dfcd146d4c24e1af533f332a5cb0232eb89e98b94f85e2373897"},"schema_version":"1.0","source":{"id":"1203.0288","kind":"arxiv","version":2}},"canonical_sha256":"098905aeff47d2f27ce769b4b4909314f82b6ad4215c3756c06a459a4701efe4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"098905aeff47d2f27ce769b4b4909314f82b6ad4215c3756c06a459a4701efe4","first_computed_at":"2026-05-18T04:00:51.260325Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:00:51.260325Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Vs0FiC1gao1oSBmTtD+3W21YSzqexx74MVLboYqwK8bOkxkgnd4uPScQk/iLb7irC6FbawOSx9EzBJh/X3lmBg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:00:51.260900Z","signed_message":"canonical_sha256_bytes"},"source_id":"1203.0288","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bb2cf5e600d692e249aa132c011ad86aed51846b50626448ac9fd5f33a478857","sha256:f5f11ca75c093eef03dc64157b03a5fbccfa337b04964fdb6e6c75c6cba55a4a"],"state_sha256":"e5336446d6f053e5fb59f182257bab1e755e7a731e56f49016de87f3f12021e5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"b9JMpf4ncqEgKQIqEwszD/lmz9VOYLruYXbNmATNxRDOOOsouZz6f5P55JW5q5hIwZEvOjZRZ4cbwLESDFwcDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-12T02:22:34.338235Z","bundle_sha256":"b78878e02d51d81f9fb0b30264c27a6f341fe45fa4570759f507cd218633570c"}}