{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:Q2V3QM4Y7WGQ6N4BXJHHINJAE4","short_pith_number":"pith:Q2V3QM4Y","canonical_record":{"source":{"id":"2111.09756","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-11-18T15:37:13Z","cross_cats_sorted":[],"title_canon_sha256":"705d428976e2cd02b9df520da8f2c79e9bdf060b98e92c650ec071750f888892","abstract_canon_sha256":"f9c2f2f5835670358e1faaea3f9711a023a3d5f5e009dc0f104285540cc78f49"},"schema_version":"1.0"},"canonical_sha256":"86abb83398fd8d0f3781ba4e743520273118f4f54f772f1a6c72e2587fae5e59","source":{"kind":"arxiv","id":"2111.09756","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.09756","created_at":"2026-07-05T06:33:01Z"},{"alias_kind":"arxiv_version","alias_value":"2111.09756v1","created_at":"2026-07-05T06:33:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.09756","created_at":"2026-07-05T06:33:01Z"},{"alias_kind":"pith_short_12","alias_value":"Q2V3QM4Y7WGQ","created_at":"2026-07-05T06:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"Q2V3QM4Y7WGQ6N4B","created_at":"2026-07-05T06:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"Q2V3QM4Y","created_at":"2026-07-05T06:33:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:Q2V3QM4Y7WGQ6N4BXJHHINJAE4","target":"record","payload":{"canonical_record":{"source":{"id":"2111.09756","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-11-18T15:37:13Z","cross_cats_sorted":[],"title_canon_sha256":"705d428976e2cd02b9df520da8f2c79e9bdf060b98e92c650ec071750f888892","abstract_canon_sha256":"f9c2f2f5835670358e1faaea3f9711a023a3d5f5e009dc0f104285540cc78f49"},"schema_version":"1.0"},"canonical_sha256":"86abb83398fd8d0f3781ba4e743520273118f4f54f772f1a6c72e2587fae5e59","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:33:01.441934Z","signature_b64":"jkwvb/Gn0yarvhoJDTQN58iHE/xpKCl7aRwaYmJccMcOWZF6K1NDWpVE6YHMy2I0hpupohGLGTP8I3elBcLwAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"86abb83398fd8d0f3781ba4e743520273118f4f54f772f1a6c72e2587fae5e59","last_reissued_at":"2026-07-05T06:33:01.441468Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:33:01.441468Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2111.09756","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":"2026-07-05T06:33:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0yCJrEgNXXK+fgZzGG08GnVmfjtKOR+r6NeIJv1N4HafUywh3FhHtnEHmwOchULaHfBcLDNnuo0B2EtRW0kzCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T15:05:31.884636Z"},"content_sha256":"dd565b7b5dea6ece2c5c4a912777369e3a1b30798d12f9399a526b0310b44fad","schema_version":"1.0","event_id":"sha256:dd565b7b5dea6ece2c5c4a912777369e3a1b30798d12f9399a526b0310b44fad"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:Q2V3QM4Y7WGQ6N4BXJHHINJAE4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Deterministic quantum phase estimation beyond the ideal NOON state limit","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Jens Arnbak Holb{\\o}ll Nielsen, Jonas Schou Neergaard-Nielsen, Tobias Gehring, Ulrik Lund Andersen","submitted_at":"2021-11-18T15:37:13Z","abstract_excerpt":"The measurement of physical parameters is one of the main pillars of science. A classic example is the measurement of the optical phase enabled by optical interferometry where the best sensitivity achievable with N photons scales as 1/N - known as the Heisenberg limit . To achieve phase estimation at the Heisenberg limit, it has been common to consider protocols based on highly complex NOON states of light. However, despite decades of research and several experimental explorations, there has been no demonstration of deterministic phase estimation with NOON states reaching the Heisenberg limit "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.09756","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2111.09756/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T06:33:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"juC99mwKlu7CMZUPnPBMFvpDRBPrHtxDApXlHm87tniKuTRGuLmAqnYbo7nCll7/OXEIVkPUf1cTFsOeBOtYCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T15:05:31.885893Z"},"content_sha256":"e30cce0f3cdc9eb128f5339bb5e24712c3ee58729e20cf81eef24e4a6294b552","schema_version":"1.0","event_id":"sha256:e30cce0f3cdc9eb128f5339bb5e24712c3ee58729e20cf81eef24e4a6294b552"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Q2V3QM4Y7WGQ6N4BXJHHINJAE4/bundle.json","state_url":"https://pith.science/pith/Q2V3QM4Y7WGQ6N4BXJHHINJAE4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Q2V3QM4Y7WGQ6N4BXJHHINJAE4/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":"2026-08-19T15:05:31Z","links":{"resolver":"https://pith.science/pith/Q2V3QM4Y7WGQ6N4BXJHHINJAE4","bundle":"https://pith.science/pith/Q2V3QM4Y7WGQ6N4BXJHHINJAE4/bundle.json","state":"https://pith.science/pith/Q2V3QM4Y7WGQ6N4BXJHHINJAE4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Q2V3QM4Y7WGQ6N4BXJHHINJAE4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:Q2V3QM4Y7WGQ6N4BXJHHINJAE4","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":"f9c2f2f5835670358e1faaea3f9711a023a3d5f5e009dc0f104285540cc78f49","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-11-18T15:37:13Z","title_canon_sha256":"705d428976e2cd02b9df520da8f2c79e9bdf060b98e92c650ec071750f888892"},"schema_version":"1.0","source":{"id":"2111.09756","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.09756","created_at":"2026-07-05T06:33:01Z"},{"alias_kind":"arxiv_version","alias_value":"2111.09756v1","created_at":"2026-07-05T06:33:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.09756","created_at":"2026-07-05T06:33:01Z"},{"alias_kind":"pith_short_12","alias_value":"Q2V3QM4Y7WGQ","created_at":"2026-07-05T06:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"Q2V3QM4Y7WGQ6N4B","created_at":"2026-07-05T06:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"Q2V3QM4Y","created_at":"2026-07-05T06:33:01Z"}],"graph_snapshots":[{"event_id":"sha256:e30cce0f3cdc9eb128f5339bb5e24712c3ee58729e20cf81eef24e4a6294b552","target":"graph","created_at":"2026-07-05T06:33:01Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2111.09756/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The measurement of physical parameters is one of the main pillars of science. A classic example is the measurement of the optical phase enabled by optical interferometry where the best sensitivity achievable with N photons scales as 1/N - known as the Heisenberg limit . To achieve phase estimation at the Heisenberg limit, it has been common to consider protocols based on highly complex NOON states of light. However, despite decades of research and several experimental explorations, there has been no demonstration of deterministic phase estimation with NOON states reaching the Heisenberg limit ","authors_text":"Jens Arnbak Holb{\\o}ll Nielsen, Jonas Schou Neergaard-Nielsen, Tobias Gehring, Ulrik Lund Andersen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-11-18T15:37:13Z","title":"Deterministic quantum phase estimation beyond the ideal NOON state limit"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.09756","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:dd565b7b5dea6ece2c5c4a912777369e3a1b30798d12f9399a526b0310b44fad","target":"record","created_at":"2026-07-05T06:33:01Z","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":"f9c2f2f5835670358e1faaea3f9711a023a3d5f5e009dc0f104285540cc78f49","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-11-18T15:37:13Z","title_canon_sha256":"705d428976e2cd02b9df520da8f2c79e9bdf060b98e92c650ec071750f888892"},"schema_version":"1.0","source":{"id":"2111.09756","kind":"arxiv","version":1}},"canonical_sha256":"86abb83398fd8d0f3781ba4e743520273118f4f54f772f1a6c72e2587fae5e59","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"86abb83398fd8d0f3781ba4e743520273118f4f54f772f1a6c72e2587fae5e59","first_computed_at":"2026-07-05T06:33:01.441468Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:33:01.441468Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jkwvb/Gn0yarvhoJDTQN58iHE/xpKCl7aRwaYmJccMcOWZF6K1NDWpVE6YHMy2I0hpupohGLGTP8I3elBcLwAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T06:33:01.441934Z","signed_message":"canonical_sha256_bytes"},"source_id":"2111.09756","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dd565b7b5dea6ece2c5c4a912777369e3a1b30798d12f9399a526b0310b44fad","sha256:e30cce0f3cdc9eb128f5339bb5e24712c3ee58729e20cf81eef24e4a6294b552"],"state_sha256":"7640f3d32abc44e978b76dad0fa43024fac6f76b639c53e56f40348a4aa77883"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aykc/pwH17abLUxIbY/lQaOqIJbnryyRRu/b6BpSk2StrIl+sVETcYjrZjfH+UfnZm4L95aR38sKY1xp60ygAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-19T15:05:31.893905Z","bundle_sha256":"99df9a1876441d2675e60d24b5c5f9150d9142f6ec4135f92b3efd20f0181c05"}}