{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:TG7QPZNFEMXFUXBG7LWRDDGAUD","short_pith_number":"pith:TG7QPZNF","canonical_record":{"source":{"id":"1707.08131","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-07-25T18:00:15Z","cross_cats_sorted":["physics.atom-ph","physics.ins-det"],"title_canon_sha256":"6ae6c57161107c572ea98d3ea49012de6565c4ab78b6559ae783e9e0ab16e6d3","abstract_canon_sha256":"9a4dbe620a4ed5362327cb46f85b2b2f53b515588c04e2abb00b28e62f61fa6d"},"schema_version":"1.0"},"canonical_sha256":"99bf07e5a5232e5a5c26faed118cc0a0f4a91d7d3641dd866dbf33fa03c961eb","source":{"kind":"arxiv","id":"1707.08131","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.08131","created_at":"2026-05-18T00:22:52Z"},{"alias_kind":"arxiv_version","alias_value":"1707.08131v2","created_at":"2026-05-18T00:22:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.08131","created_at":"2026-05-18T00:22:52Z"},{"alias_kind":"pith_short_12","alias_value":"TG7QPZNFEMXF","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_16","alias_value":"TG7QPZNFEMXFUXBG","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_8","alias_value":"TG7QPZNF","created_at":"2026-05-18T12:31:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:TG7QPZNFEMXFUXBG7LWRDDGAUD","target":"record","payload":{"canonical_record":{"source":{"id":"1707.08131","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-07-25T18:00:15Z","cross_cats_sorted":["physics.atom-ph","physics.ins-det"],"title_canon_sha256":"6ae6c57161107c572ea98d3ea49012de6565c4ab78b6559ae783e9e0ab16e6d3","abstract_canon_sha256":"9a4dbe620a4ed5362327cb46f85b2b2f53b515588c04e2abb00b28e62f61fa6d"},"schema_version":"1.0"},"canonical_sha256":"99bf07e5a5232e5a5c26faed118cc0a0f4a91d7d3641dd866dbf33fa03c961eb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:22:52.716932Z","signature_b64":"dQd/DlibYqZQzDU43LSjtiL63qySdnFNa72HftGjCwPNyx8OpM0qAtvPb8pltyWOoT/GrTKdeF6Ai1LAMZPEBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"99bf07e5a5232e5a5c26faed118cc0a0f4a91d7d3641dd866dbf33fa03c961eb","last_reissued_at":"2026-05-18T00:22:52.716516Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:22:52.716516Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1707.08131","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":"2026-05-18T00:22:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GAxYmklSW5icA16rdvvyp1LpDRnhqT9FtJolcSTsgi0Svcv/c9YtntO/XBn8GJjJRCVXbUOETr1QTeBHvH42AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T09:50:56.315960Z"},"content_sha256":"0ad8fb10d2af85e3a8a154e6b2c596539ab2cf9f3ccd53bb3a8e8d8b4874066f","schema_version":"1.0","event_id":"sha256:0ad8fb10d2af85e3a8a154e6b2c596539ab2cf9f3ccd53bb3a8e8d8b4874066f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:TG7QPZNFEMXFUXBG7LWRDDGAUD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Signal tracking beyond the time resolution of an atomic sensor by Kalman filtering","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph","physics.ins-det"],"primary_cat":"quant-ph","authors_text":"Charikleia Troullinou, Jan Kolodynski, Jia Kong, Morgan W. Mitchell, Ricardo Jim\\'enez-Mart\\'inez, Vito Giovanni Lucivero","submitted_at":"2017-07-25T18:00:15Z","abstract_excerpt":"We study causal waveform estimation (tracking) of time-varying signals in a paradigmatic atomic sensor, an alkali vapor monitored by Faraday rotation probing. We use Kalman filtering, which optimally tracks known linear Gaussian stochastic processes, to estimate stochastic input signals that we generate by optical pumping. Comparing the known input to the estimates, we confirm the accuracy of the atomic statistical model and the reliability of the Kalman filter, allowing recovery of waveform details far briefer than the sensor's intrinsic time resolution. With proper filter choice, we obtain s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.08131","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":"2026-05-18T00:22:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YWMdBy+tkAJGE7FqlBKr+kimX+zrDqISzgaELlsKcZGD4i91qcIkefbNv+yKRu2hYFavYZTgIDeBCS8k5neZAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T09:50:56.316307Z"},"content_sha256":"287cc75e9c3c4c80ab24c98a7ef91a73b0c2b5051e5cc020b0e353ec8798b292","schema_version":"1.0","event_id":"sha256:287cc75e9c3c4c80ab24c98a7ef91a73b0c2b5051e5cc020b0e353ec8798b292"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TG7QPZNFEMXFUXBG7LWRDDGAUD/bundle.json","state_url":"https://pith.science/pith/TG7QPZNFEMXFUXBG7LWRDDGAUD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TG7QPZNFEMXFUXBG7LWRDDGAUD/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":"2026-05-30T09:50:56Z","links":{"resolver":"https://pith.science/pith/TG7QPZNFEMXFUXBG7LWRDDGAUD","bundle":"https://pith.science/pith/TG7QPZNFEMXFUXBG7LWRDDGAUD/bundle.json","state":"https://pith.science/pith/TG7QPZNFEMXFUXBG7LWRDDGAUD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TG7QPZNFEMXFUXBG7LWRDDGAUD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:TG7QPZNFEMXFUXBG7LWRDDGAUD","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":"9a4dbe620a4ed5362327cb46f85b2b2f53b515588c04e2abb00b28e62f61fa6d","cross_cats_sorted":["physics.atom-ph","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-07-25T18:00:15Z","title_canon_sha256":"6ae6c57161107c572ea98d3ea49012de6565c4ab78b6559ae783e9e0ab16e6d3"},"schema_version":"1.0","source":{"id":"1707.08131","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.08131","created_at":"2026-05-18T00:22:52Z"},{"alias_kind":"arxiv_version","alias_value":"1707.08131v2","created_at":"2026-05-18T00:22:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.08131","created_at":"2026-05-18T00:22:52Z"},{"alias_kind":"pith_short_12","alias_value":"TG7QPZNFEMXF","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_16","alias_value":"TG7QPZNFEMXFUXBG","created_at":"2026-05-18T12:31:46Z"},{"alias_kind":"pith_short_8","alias_value":"TG7QPZNF","created_at":"2026-05-18T12:31:46Z"}],"graph_snapshots":[{"event_id":"sha256:287cc75e9c3c4c80ab24c98a7ef91a73b0c2b5051e5cc020b0e353ec8798b292","target":"graph","created_at":"2026-05-18T00:22:52Z","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 study causal waveform estimation (tracking) of time-varying signals in a paradigmatic atomic sensor, an alkali vapor monitored by Faraday rotation probing. We use Kalman filtering, which optimally tracks known linear Gaussian stochastic processes, to estimate stochastic input signals that we generate by optical pumping. Comparing the known input to the estimates, we confirm the accuracy of the atomic statistical model and the reliability of the Kalman filter, allowing recovery of waveform details far briefer than the sensor's intrinsic time resolution. With proper filter choice, we obtain s","authors_text":"Charikleia Troullinou, Jan Kolodynski, Jia Kong, Morgan W. Mitchell, Ricardo Jim\\'enez-Mart\\'inez, Vito Giovanni Lucivero","cross_cats":["physics.atom-ph","physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-07-25T18:00:15Z","title":"Signal tracking beyond the time resolution of an atomic sensor by Kalman filtering"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.08131","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":"sha256:0ad8fb10d2af85e3a8a154e6b2c596539ab2cf9f3ccd53bb3a8e8d8b4874066f","target":"record","created_at":"2026-05-18T00:22:52Z","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":"9a4dbe620a4ed5362327cb46f85b2b2f53b515588c04e2abb00b28e62f61fa6d","cross_cats_sorted":["physics.atom-ph","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-07-25T18:00:15Z","title_canon_sha256":"6ae6c57161107c572ea98d3ea49012de6565c4ab78b6559ae783e9e0ab16e6d3"},"schema_version":"1.0","source":{"id":"1707.08131","kind":"arxiv","version":2}},"canonical_sha256":"99bf07e5a5232e5a5c26faed118cc0a0f4a91d7d3641dd866dbf33fa03c961eb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"99bf07e5a5232e5a5c26faed118cc0a0f4a91d7d3641dd866dbf33fa03c961eb","first_computed_at":"2026-05-18T00:22:52.716516Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:22:52.716516Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dQd/DlibYqZQzDU43LSjtiL63qySdnFNa72HftGjCwPNyx8OpM0qAtvPb8pltyWOoT/GrTKdeF6Ai1LAMZPEBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:22:52.716932Z","signed_message":"canonical_sha256_bytes"},"source_id":"1707.08131","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0ad8fb10d2af85e3a8a154e6b2c596539ab2cf9f3ccd53bb3a8e8d8b4874066f","sha256:287cc75e9c3c4c80ab24c98a7ef91a73b0c2b5051e5cc020b0e353ec8798b292"],"state_sha256":"89587b4b28d9da31bd8008198d38332722e4b8442771aa6703d2345412541429"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BtiV6CMjLmTMIMlkRYQCSmqwrcQkyzifhcUJupSF9tuFhdL7tZ3QArlBRC9bNrF07I5sbBlWTu+4HhuFGZsrCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T09:50:56.318428Z","bundle_sha256":"ac8dad5157a10a52872af50520ad8ecdc3606a545d7e3eb9bf52465244b0d347"}}