{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:BYRJUFXMPB37CVWJAYYIG5OSGW","short_pith_number":"pith:BYRJUFXM","canonical_record":{"source":{"id":"1101.4885","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-01-25T17:51:36Z","cross_cats_sorted":[],"title_canon_sha256":"ea8a5f0821732fefc51c997dec097f06e8ff440aaeb005e1ef83750a73e0165a","abstract_canon_sha256":"5ff6a1b2957c6648709715166bd9c294af697d189da8b5a0d012072eb0c7c721"},"schema_version":"1.0"},"canonical_sha256":"0e229a16ec7877f156c906308375d23580051b11aed8a88025228c0ec7441c0e","source":{"kind":"arxiv","id":"1101.4885","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.4885","created_at":"2026-05-18T04:22:49Z"},{"alias_kind":"arxiv_version","alias_value":"1101.4885v1","created_at":"2026-05-18T04:22:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.4885","created_at":"2026-05-18T04:22:49Z"},{"alias_kind":"pith_short_12","alias_value":"BYRJUFXMPB37","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"BYRJUFXMPB37CVWJ","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"BYRJUFXM","created_at":"2026-05-18T12:26:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:BYRJUFXMPB37CVWJAYYIG5OSGW","target":"record","payload":{"canonical_record":{"source":{"id":"1101.4885","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-01-25T17:51:36Z","cross_cats_sorted":[],"title_canon_sha256":"ea8a5f0821732fefc51c997dec097f06e8ff440aaeb005e1ef83750a73e0165a","abstract_canon_sha256":"5ff6a1b2957c6648709715166bd9c294af697d189da8b5a0d012072eb0c7c721"},"schema_version":"1.0"},"canonical_sha256":"0e229a16ec7877f156c906308375d23580051b11aed8a88025228c0ec7441c0e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:22:49.801337Z","signature_b64":"Neo605UnM0DH0ZUEK9EYOnzT2mYdCsjP+xhAJCTuAWBrgZ0q/5/3YxVEk2ozzHIYeBA6ndLpg6LCRcHR2B5AAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0e229a16ec7877f156c906308375d23580051b11aed8a88025228c0ec7441c0e","last_reissued_at":"2026-05-18T04:22:49.800684Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:22:49.800684Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1101.4885","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:22:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eIeITQBb6r0NFd809DSjfUC+6QtuyN3oRx0xY8G5/TtqmUujroQtpdbvV9Pg7OpeIAo+1eqWb8cksbR0RGPrAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T08:20:31.503577Z"},"content_sha256":"33bc095041791802c4535a3700e37e031296ebe688254ea866a95a4bbb76c1f9","schema_version":"1.0","event_id":"sha256:33bc095041791802c4535a3700e37e031296ebe688254ea866a95a4bbb76c1f9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:BYRJUFXMPB37CVWJAYYIG5OSGW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Single Ion Quantum Lock-In Amplifier","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Anna Keselman, Nitzan Akerman, Roee Ozeri, Shlomi Kotler, Yinnon Glickman","submitted_at":"2011-01-25T17:51:36Z","abstract_excerpt":"We report on the implementation of a quantum analog to the classical lock-in amplifier. All the lock-in operations: modulation, detection and mixing, are performed via the application of non-commuting quantum operators on the electronic spin state of a single trapped Sr+ ion. We significantly increase its sensitivity to external fields while extending phase coherence by three orders of magnitude, to more than one second. With this technique we measure magnetic fields with sensitivity of 25 pT/sqrt(Hz) and light shifts with an uncertainty below 140 mHz after 1320 seconds of averaging. These sen"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.4885","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:22:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6HdbiBItHE9MJpxCoEv59y+S0AK9YWjuLm8W/uTAkTfzJe8lh97IJ0/PvJX/aDyFKxAdSL0skIh+Krw4X6cRCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T08:20:31.503926Z"},"content_sha256":"d56ea33b1eba74f0de7d1cdb7730e85626bffea418fc63552885eb94ed702b25","schema_version":"1.0","event_id":"sha256:d56ea33b1eba74f0de7d1cdb7730e85626bffea418fc63552885eb94ed702b25"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BYRJUFXMPB37CVWJAYYIG5OSGW/bundle.json","state_url":"https://pith.science/pith/BYRJUFXMPB37CVWJAYYIG5OSGW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BYRJUFXMPB37CVWJAYYIG5OSGW/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":"2026-05-21T08:20:31Z","links":{"resolver":"https://pith.science/pith/BYRJUFXMPB37CVWJAYYIG5OSGW","bundle":"https://pith.science/pith/BYRJUFXMPB37CVWJAYYIG5OSGW/bundle.json","state":"https://pith.science/pith/BYRJUFXMPB37CVWJAYYIG5OSGW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BYRJUFXMPB37CVWJAYYIG5OSGW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:BYRJUFXMPB37CVWJAYYIG5OSGW","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":"5ff6a1b2957c6648709715166bd9c294af697d189da8b5a0d012072eb0c7c721","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-01-25T17:51:36Z","title_canon_sha256":"ea8a5f0821732fefc51c997dec097f06e8ff440aaeb005e1ef83750a73e0165a"},"schema_version":"1.0","source":{"id":"1101.4885","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.4885","created_at":"2026-05-18T04:22:49Z"},{"alias_kind":"arxiv_version","alias_value":"1101.4885v1","created_at":"2026-05-18T04:22:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.4885","created_at":"2026-05-18T04:22:49Z"},{"alias_kind":"pith_short_12","alias_value":"BYRJUFXMPB37","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"BYRJUFXMPB37CVWJ","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"BYRJUFXM","created_at":"2026-05-18T12:26:24Z"}],"graph_snapshots":[{"event_id":"sha256:d56ea33b1eba74f0de7d1cdb7730e85626bffea418fc63552885eb94ed702b25","target":"graph","created_at":"2026-05-18T04:22:49Z","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":"We report on the implementation of a quantum analog to the classical lock-in amplifier. All the lock-in operations: modulation, detection and mixing, are performed via the application of non-commuting quantum operators on the electronic spin state of a single trapped Sr+ ion. We significantly increase its sensitivity to external fields while extending phase coherence by three orders of magnitude, to more than one second. With this technique we measure magnetic fields with sensitivity of 25 pT/sqrt(Hz) and light shifts with an uncertainty below 140 mHz after 1320 seconds of averaging. These sen","authors_text":"Anna Keselman, Nitzan Akerman, Roee Ozeri, Shlomi Kotler, Yinnon Glickman","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-01-25T17:51:36Z","title":"Single Ion Quantum Lock-In Amplifier"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.4885","kind":"arxiv","version":1},"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":"sha256:33bc095041791802c4535a3700e37e031296ebe688254ea866a95a4bbb76c1f9","target":"record","created_at":"2026-05-18T04:22:49Z","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":"5ff6a1b2957c6648709715166bd9c294af697d189da8b5a0d012072eb0c7c721","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-01-25T17:51:36Z","title_canon_sha256":"ea8a5f0821732fefc51c997dec097f06e8ff440aaeb005e1ef83750a73e0165a"},"schema_version":"1.0","source":{"id":"1101.4885","kind":"arxiv","version":1}},"canonical_sha256":"0e229a16ec7877f156c906308375d23580051b11aed8a88025228c0ec7441c0e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0e229a16ec7877f156c906308375d23580051b11aed8a88025228c0ec7441c0e","first_computed_at":"2026-05-18T04:22:49.800684Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:22:49.800684Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Neo605UnM0DH0ZUEK9EYOnzT2mYdCsjP+xhAJCTuAWBrgZ0q/5/3YxVEk2ozzHIYeBA6ndLpg6LCRcHR2B5AAA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:22:49.801337Z","signed_message":"canonical_sha256_bytes"},"source_id":"1101.4885","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:33bc095041791802c4535a3700e37e031296ebe688254ea866a95a4bbb76c1f9","sha256:d56ea33b1eba74f0de7d1cdb7730e85626bffea418fc63552885eb94ed702b25"],"state_sha256":"37fd7f1be860256f2ebe18382f6b6dd1a68268bfaf631ddf2014f53240ac816a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DfCYE+2A7ByYQjR2xpXZ8Gg32Xri9PBE2UQCjL4IILv1iyJqYbexeafNdRSMRhI3HY24gMvVoj/cp93dc0QdAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T08:20:31.506516Z","bundle_sha256":"b33a0caaa89c126d23ffbcc46fb37a9983b0aaa6948a4e8a29f6ea06190c38b6"}}