{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:XYRUTNO7EUTPLMJKEWVDVAGHNU","short_pith_number":"pith:XYRUTNO7","canonical_record":{"source":{"id":"1405.4878","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-05-19T20:11:40Z","cross_cats_sorted":["cond-mat.quant-gas","physics.atom-ph"],"title_canon_sha256":"db4fba179a1de6df07bb3f218f833e2793b68e4cfbc3682eab469353df2dde89","abstract_canon_sha256":"f31128a9ffecdfa483c7bf115288980634f0d59eb4ba96cf67e21bd7eb0d630a"},"schema_version":"1.0"},"canonical_sha256":"be2349b5df2526f5b12a25aa3a80c76d1243342b8375bd1ea0f4ea442e373e71","source":{"kind":"arxiv","id":"1405.4878","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.4878","created_at":"2026-05-18T02:28:47Z"},{"alias_kind":"arxiv_version","alias_value":"1405.4878v4","created_at":"2026-05-18T02:28:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.4878","created_at":"2026-05-18T02:28:47Z"},{"alias_kind":"pith_short_12","alias_value":"XYRUTNO7EUTP","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"XYRUTNO7EUTPLMJK","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"XYRUTNO7","created_at":"2026-05-18T12:28:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:XYRUTNO7EUTPLMJKEWVDVAGHNU","target":"record","payload":{"canonical_record":{"source":{"id":"1405.4878","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-05-19T20:11:40Z","cross_cats_sorted":["cond-mat.quant-gas","physics.atom-ph"],"title_canon_sha256":"db4fba179a1de6df07bb3f218f833e2793b68e4cfbc3682eab469353df2dde89","abstract_canon_sha256":"f31128a9ffecdfa483c7bf115288980634f0d59eb4ba96cf67e21bd7eb0d630a"},"schema_version":"1.0"},"canonical_sha256":"be2349b5df2526f5b12a25aa3a80c76d1243342b8375bd1ea0f4ea442e373e71","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:28:47.854807Z","signature_b64":"tBkpVy5QNBs2dK8Mpt+TdGOqhylx9WiQgPu8BExvRvrhZUUombHU377O+p9Xu+WsyfAj5svxg2qs4pYNlb5VAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"be2349b5df2526f5b12a25aa3a80c76d1243342b8375bd1ea0f4ea442e373e71","last_reissued_at":"2026-05-18T02:28:47.854378Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:28:47.854378Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1405.4878","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:28:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QfAkCqC4wxXhZzYiLzhpO6ZCfA+S/WU2OmcFySBB+/E7K03kC9OhYoiRl3FMauKJHqzzV3OblaC080R0AoXTAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-12T08:28:34.783768Z"},"content_sha256":"fd73f5b07264be43762f928cfc35fa296343da54cd64eaa099ca6c8f02ba23ce","schema_version":"1.0","event_id":"sha256:fd73f5b07264be43762f928cfc35fa296343da54cd64eaa099ca6c8f02ba23ce"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:XYRUTNO7EUTPLMJKEWVDVAGHNU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum metrology from a quantum information science perspective","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.quant-gas","physics.atom-ph"],"primary_cat":"quant-ph","authors_text":"Geza Toth, Iagoba Apellaniz","submitted_at":"2014-05-19T20:11:40Z","abstract_excerpt":"We summarise important recent advances in quantum metrology, in connection to experiments in cold gases, trapped cold atoms and photons. First we review simple metrological setups, such as quantum metrology with spin squeezed states, with Greenberger-Horne-Zeilinger states, Dicke states and singlet states. We calculate the highest precision achievable in these schemes. Then, we present the fundamental notions of quantum metrology, such as shot-noise scaling, Heisenberg scaling, the quantum Fisher information and the Cramer-Rao bound. Using these, we demonstrate that entanglement is needed to s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.4878","kind":"arxiv","version":4},"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":"2026-05-18T02:28:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OSJW1DkytdcCkiXh58hyXYEA9yrErryqgqxbI/4pE5f9fgawm+DMEWX4fVunweJax30ZH4n5HPcpAUNzXViVCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-12T08:28:34.784117Z"},"content_sha256":"36a83fa739e0aafc976c982fa63896c022dc085f43813eaebdfa75cb6ed059fc","schema_version":"1.0","event_id":"sha256:36a83fa739e0aafc976c982fa63896c022dc085f43813eaebdfa75cb6ed059fc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XYRUTNO7EUTPLMJKEWVDVAGHNU/bundle.json","state_url":"https://pith.science/pith/XYRUTNO7EUTPLMJKEWVDVAGHNU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XYRUTNO7EUTPLMJKEWVDVAGHNU/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":"2026-07-12T08:28:34Z","links":{"resolver":"https://pith.science/pith/XYRUTNO7EUTPLMJKEWVDVAGHNU","bundle":"https://pith.science/pith/XYRUTNO7EUTPLMJKEWVDVAGHNU/bundle.json","state":"https://pith.science/pith/XYRUTNO7EUTPLMJKEWVDVAGHNU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XYRUTNO7EUTPLMJKEWVDVAGHNU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:XYRUTNO7EUTPLMJKEWVDVAGHNU","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":"f31128a9ffecdfa483c7bf115288980634f0d59eb4ba96cf67e21bd7eb0d630a","cross_cats_sorted":["cond-mat.quant-gas","physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-05-19T20:11:40Z","title_canon_sha256":"db4fba179a1de6df07bb3f218f833e2793b68e4cfbc3682eab469353df2dde89"},"schema_version":"1.0","source":{"id":"1405.4878","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.4878","created_at":"2026-05-18T02:28:47Z"},{"alias_kind":"arxiv_version","alias_value":"1405.4878v4","created_at":"2026-05-18T02:28:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.4878","created_at":"2026-05-18T02:28:47Z"},{"alias_kind":"pith_short_12","alias_value":"XYRUTNO7EUTP","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"XYRUTNO7EUTPLMJK","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"XYRUTNO7","created_at":"2026-05-18T12:28:57Z"}],"graph_snapshots":[{"event_id":"sha256:36a83fa739e0aafc976c982fa63896c022dc085f43813eaebdfa75cb6ed059fc","target":"graph","created_at":"2026-05-18T02:28:47Z","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 summarise important recent advances in quantum metrology, in connection to experiments in cold gases, trapped cold atoms and photons. First we review simple metrological setups, such as quantum metrology with spin squeezed states, with Greenberger-Horne-Zeilinger states, Dicke states and singlet states. We calculate the highest precision achievable in these schemes. Then, we present the fundamental notions of quantum metrology, such as shot-noise scaling, Heisenberg scaling, the quantum Fisher information and the Cramer-Rao bound. Using these, we demonstrate that entanglement is needed to s","authors_text":"Geza Toth, Iagoba Apellaniz","cross_cats":["cond-mat.quant-gas","physics.atom-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-05-19T20:11:40Z","title":"Quantum metrology from a quantum information science perspective"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.4878","kind":"arxiv","version":4},"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:fd73f5b07264be43762f928cfc35fa296343da54cd64eaa099ca6c8f02ba23ce","target":"record","created_at":"2026-05-18T02:28:47Z","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":"f31128a9ffecdfa483c7bf115288980634f0d59eb4ba96cf67e21bd7eb0d630a","cross_cats_sorted":["cond-mat.quant-gas","physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-05-19T20:11:40Z","title_canon_sha256":"db4fba179a1de6df07bb3f218f833e2793b68e4cfbc3682eab469353df2dde89"},"schema_version":"1.0","source":{"id":"1405.4878","kind":"arxiv","version":4}},"canonical_sha256":"be2349b5df2526f5b12a25aa3a80c76d1243342b8375bd1ea0f4ea442e373e71","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"be2349b5df2526f5b12a25aa3a80c76d1243342b8375bd1ea0f4ea442e373e71","first_computed_at":"2026-05-18T02:28:47.854378Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:28:47.854378Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tBkpVy5QNBs2dK8Mpt+TdGOqhylx9WiQgPu8BExvRvrhZUUombHU377O+p9Xu+WsyfAj5svxg2qs4pYNlb5VAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:28:47.854807Z","signed_message":"canonical_sha256_bytes"},"source_id":"1405.4878","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fd73f5b07264be43762f928cfc35fa296343da54cd64eaa099ca6c8f02ba23ce","sha256:36a83fa739e0aafc976c982fa63896c022dc085f43813eaebdfa75cb6ed059fc"],"state_sha256":"94f4e4564702cd344724b7b6736eb18a00119e2906a6bf940fa4300ae17244eb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"A3/+/XqpF0QsNPPdUY8oUw8lWBA51rzMa/4opVQy45vC8YQidKAwFB3FzPIdu6ouNRvL7JaF6gEk93zh67V+BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-12T08:28:34.786387Z","bundle_sha256":"4d8fd30bbeed7332748c019028c2048a50f3e2d3eca9250acf4210a03cc51a63"}}