{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:3TQCVSHDYQ3OMNLZN3YRQQMLUP","short_pith_number":"pith:3TQCVSHD","canonical_record":{"source":{"id":"1503.01365","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-03-04T16:25:41Z","cross_cats_sorted":[],"title_canon_sha256":"a8f79a061c3b9e5cd94521409cefa5d149e699657fb8b970d746cb945261411a","abstract_canon_sha256":"ab4d73802cc796dc56b36efacb4264522f5768e7b84c674fbedc1e5245f6f695"},"schema_version":"1.0"},"canonical_sha256":"dce02ac8e3c436e635796ef118418ba3e2398df806cf88df2ee9cd472ff2171a","source":{"kind":"arxiv","id":"1503.01365","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.01365","created_at":"2026-05-18T01:29:21Z"},{"alias_kind":"arxiv_version","alias_value":"1503.01365v1","created_at":"2026-05-18T01:29:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.01365","created_at":"2026-05-18T01:29:21Z"},{"alias_kind":"pith_short_12","alias_value":"3TQCVSHDYQ3O","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"3TQCVSHDYQ3OMNLZ","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"3TQCVSHD","created_at":"2026-05-18T12:29:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:3TQCVSHDYQ3OMNLZN3YRQQMLUP","target":"record","payload":{"canonical_record":{"source":{"id":"1503.01365","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-03-04T16:25:41Z","cross_cats_sorted":[],"title_canon_sha256":"a8f79a061c3b9e5cd94521409cefa5d149e699657fb8b970d746cb945261411a","abstract_canon_sha256":"ab4d73802cc796dc56b36efacb4264522f5768e7b84c674fbedc1e5245f6f695"},"schema_version":"1.0"},"canonical_sha256":"dce02ac8e3c436e635796ef118418ba3e2398df806cf88df2ee9cd472ff2171a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:29:21.299557Z","signature_b64":"S7JCq5jeXYlb6L5qgmLrXcRsiUiFpgIQZsGuv5AgjIjjn2AIylXEpDaIqWfqcgitMAB3MgQyEFRv7Lv1+S/GAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dce02ac8e3c436e635796ef118418ba3e2398df806cf88df2ee9cd472ff2171a","last_reissued_at":"2026-05-18T01:29:21.298864Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:29:21.298864Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1503.01365","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":"2026-05-18T01:29:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Pi3jIqyjN32lNxU92d/cW9Gkkfpy/OC5wgV66Gj48+RbQ1BdH0yMM3GPi4eq03rmWwklyCSnHUCm8NTUPwbKDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T06:30:24.097786Z"},"content_sha256":"d91ff7919519f98fa9390d21ff309962826f1f5f0e0010e073661b46917f1cf6","schema_version":"1.0","event_id":"sha256:d91ff7919519f98fa9390d21ff309962826f1f5f0e0010e073661b46917f1cf6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:3TQCVSHDYQ3OMNLZN3YRQQMLUP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ab-initio Quantum Enhanced Optical Phase Estimation Using Real-time Feedback Control","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Adriano A. Berni, Bo M. Nielsen, Matteo G.A. Paris, Tobias Gehring, Ulrik L. Andersen, Vitus H\\\"andchen","submitted_at":"2015-03-04T16:25:41Z","abstract_excerpt":"Optical phase estimation is a vital measurement primitive that is used to perform accurate measurements of various physical quantities like length, velocity and displacements. The precision of such measurements can be largely enhanced by the use of entangled or squeezed states of light as demonstrated in a variety of different optical systems. Most of these accounts however deal with the measurement of a very small shift of an already known phase, which is in stark contrast to ab-initio phase estimation where the initial phase is unknown. Here we report on the realization of a quantum enhanced"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.01365","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":"2026-05-18T01:29:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"i/g9VdcVfPZxsSzoHZT0EVbHgCh8KZFE2WeD+CcJZ3r9DK72kGk5YPOwlnKUjrgIcSMkIae5tabzHLVwSMkRCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T06:30:24.098443Z"},"content_sha256":"9b200cafe9f42d975f67fafdb95a860b9b115da978174e464212f498636b8cc4","schema_version":"1.0","event_id":"sha256:9b200cafe9f42d975f67fafdb95a860b9b115da978174e464212f498636b8cc4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3TQCVSHDYQ3OMNLZN3YRQQMLUP/bundle.json","state_url":"https://pith.science/pith/3TQCVSHDYQ3OMNLZN3YRQQMLUP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3TQCVSHDYQ3OMNLZN3YRQQMLUP/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":"2026-05-30T06:30:24Z","links":{"resolver":"https://pith.science/pith/3TQCVSHDYQ3OMNLZN3YRQQMLUP","bundle":"https://pith.science/pith/3TQCVSHDYQ3OMNLZN3YRQQMLUP/bundle.json","state":"https://pith.science/pith/3TQCVSHDYQ3OMNLZN3YRQQMLUP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3TQCVSHDYQ3OMNLZN3YRQQMLUP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:3TQCVSHDYQ3OMNLZN3YRQQMLUP","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":"ab4d73802cc796dc56b36efacb4264522f5768e7b84c674fbedc1e5245f6f695","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-03-04T16:25:41Z","title_canon_sha256":"a8f79a061c3b9e5cd94521409cefa5d149e699657fb8b970d746cb945261411a"},"schema_version":"1.0","source":{"id":"1503.01365","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.01365","created_at":"2026-05-18T01:29:21Z"},{"alias_kind":"arxiv_version","alias_value":"1503.01365v1","created_at":"2026-05-18T01:29:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.01365","created_at":"2026-05-18T01:29:21Z"},{"alias_kind":"pith_short_12","alias_value":"3TQCVSHDYQ3O","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"3TQCVSHDYQ3OMNLZ","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"3TQCVSHD","created_at":"2026-05-18T12:29:02Z"}],"graph_snapshots":[{"event_id":"sha256:9b200cafe9f42d975f67fafdb95a860b9b115da978174e464212f498636b8cc4","target":"graph","created_at":"2026-05-18T01:29:21Z","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":"Optical phase estimation is a vital measurement primitive that is used to perform accurate measurements of various physical quantities like length, velocity and displacements. The precision of such measurements can be largely enhanced by the use of entangled or squeezed states of light as demonstrated in a variety of different optical systems. Most of these accounts however deal with the measurement of a very small shift of an already known phase, which is in stark contrast to ab-initio phase estimation where the initial phase is unknown. Here we report on the realization of a quantum enhanced","authors_text":"Adriano A. Berni, Bo M. Nielsen, Matteo G.A. Paris, Tobias Gehring, Ulrik L. Andersen, Vitus H\\\"andchen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-03-04T16:25:41Z","title":"Ab-initio Quantum Enhanced Optical Phase Estimation Using Real-time Feedback Control"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.01365","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:d91ff7919519f98fa9390d21ff309962826f1f5f0e0010e073661b46917f1cf6","target":"record","created_at":"2026-05-18T01:29:21Z","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":"ab4d73802cc796dc56b36efacb4264522f5768e7b84c674fbedc1e5245f6f695","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-03-04T16:25:41Z","title_canon_sha256":"a8f79a061c3b9e5cd94521409cefa5d149e699657fb8b970d746cb945261411a"},"schema_version":"1.0","source":{"id":"1503.01365","kind":"arxiv","version":1}},"canonical_sha256":"dce02ac8e3c436e635796ef118418ba3e2398df806cf88df2ee9cd472ff2171a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dce02ac8e3c436e635796ef118418ba3e2398df806cf88df2ee9cd472ff2171a","first_computed_at":"2026-05-18T01:29:21.298864Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:29:21.298864Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"S7JCq5jeXYlb6L5qgmLrXcRsiUiFpgIQZsGuv5AgjIjjn2AIylXEpDaIqWfqcgitMAB3MgQyEFRv7Lv1+S/GAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:29:21.299557Z","signed_message":"canonical_sha256_bytes"},"source_id":"1503.01365","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d91ff7919519f98fa9390d21ff309962826f1f5f0e0010e073661b46917f1cf6","sha256:9b200cafe9f42d975f67fafdb95a860b9b115da978174e464212f498636b8cc4"],"state_sha256":"d3cacefe783cd8ad351f567d7a7e55c26cf2de1820c3fb1ac882dcd11f275ff7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5oIOZSsLlw3kU3fDALQHnxIF/I0Wkosui7QMrPUNN2Vc00O9yUT/EErrmEjKt9t3RAcXQcnMRTTn2EZ2V3L6Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T06:30:24.101785Z","bundle_sha256":"f71cdb1c7e6f263c55d2b4c5a452b35438ef3c44b378f2278f0dede1db289e6e"}}