{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:JPUUPZ54MG3KHMXAXRENOESJLC","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":"cc98303bc4c42644b3d0ce1bae31c6cba93d0cb307c44c0afcdb38a6d5fadfd4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-01-28T15:04:49Z","title_canon_sha256":"06ad37930a38c474a24a32955a1689f8d9b35609f6c3300ba11980cabeb8a16c"},"schema_version":"1.0","source":{"id":"2101.12048","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.12048","created_at":"2026-07-05T03:07:46Z"},{"alias_kind":"arxiv_version","alias_value":"2101.12048v1","created_at":"2026-07-05T03:07:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.12048","created_at":"2026-07-05T03:07:46Z"},{"alias_kind":"pith_short_12","alias_value":"JPUUPZ54MG3K","created_at":"2026-07-05T03:07:46Z"},{"alias_kind":"pith_short_16","alias_value":"JPUUPZ54MG3KHMXA","created_at":"2026-07-05T03:07:46Z"},{"alias_kind":"pith_short_8","alias_value":"JPUUPZ54","created_at":"2026-07-05T03:07:46Z"}],"graph_snapshots":[{"event_id":"sha256:0c13461ab42ba39e9b8d59525d298a893eb74410e423988ac73008d83eaa9088","target":"graph","created_at":"2026-07-05T03:07:46Z","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/2101.12048/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Precision measurement plays a crucial role in all fields of science. The use of entangled sensors in quantum metrology improves the precision limit from the standard quantum limit (SQL) to the Heisenberg limit (HL). To date, most experiments beating the SQL are performed on the sensors which are well isolated under extreme conditions. However, it has not been realized in solid-state spin systems at ambient conditions, owing to its intrinsic complexity for the preparation and survival of pure and entangled quantum states. Here we show a full interferometer sequence beating the SQL by employing ","authors_text":"Fazhan Shi, Jiangfeng Du, Mengqi Wang, Pei Yu, Pengfei Wang, Shaoyi Xu, Tianyu Xie, Wenchao Ma, Xiangyu Ye, Xi Kong, Ya Wang, Zhiping Yang, Zhiyuan Zhao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-01-28T15:04:49Z","title":"Beating the Standard Quantum Limit under Ambient Conditions with Solid-State Spins"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.12048","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":"sha256:79de693de60ffaf1d05d0be131cfb3607b62041e51324886fe3a0f889c6de246","target":"record","created_at":"2026-07-05T03:07:46Z","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":"cc98303bc4c42644b3d0ce1bae31c6cba93d0cb307c44c0afcdb38a6d5fadfd4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-01-28T15:04:49Z","title_canon_sha256":"06ad37930a38c474a24a32955a1689f8d9b35609f6c3300ba11980cabeb8a16c"},"schema_version":"1.0","source":{"id":"2101.12048","kind":"arxiv","version":1}},"canonical_sha256":"4be947e7bc61b6a3b2e0bc48d712495881b052f5b1c1c60273480a9997a1593c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4be947e7bc61b6a3b2e0bc48d712495881b052f5b1c1c60273480a9997a1593c","first_computed_at":"2026-07-05T03:07:46.392925Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:07:46.392925Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"p/tkOVs3mivPymdKQSQn97f9wPllnzAdNPJ/zvcDtPWZCA/ZnGxGcmkyyLhCoLMKOnryCbnEB5DrQ6AiR9oTBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:07:46.393370Z","signed_message":"canonical_sha256_bytes"},"source_id":"2101.12048","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:79de693de60ffaf1d05d0be131cfb3607b62041e51324886fe3a0f889c6de246","sha256:0c13461ab42ba39e9b8d59525d298a893eb74410e423988ac73008d83eaa9088"],"state_sha256":"c078c12cd14e5c2baa89f46f5aa2c6478e10edd4b0c4c14356a453ff4b05db66"}