{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:ETAOQ2GF2A4UKX6OY7N7TCP7PG","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":"f5ca743b267bd618e9ca42d6fc925d4d007753047580b7b2a69ffddd8915f328","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-10-26T19:06:41Z","title_canon_sha256":"bc9e3e21e79f6300011f1b1723c8635b1801a34a6d931afbb54eac2f071bf04f"},"schema_version":"1.0","source":{"id":"2010.13851","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2010.13851","created_at":"2026-07-05T02:40:19Z"},{"alias_kind":"arxiv_version","alias_value":"2010.13851v2","created_at":"2026-07-05T02:40:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2010.13851","created_at":"2026-07-05T02:40:19Z"},{"alias_kind":"pith_short_12","alias_value":"ETAOQ2GF2A4U","created_at":"2026-07-05T02:40:19Z"},{"alias_kind":"pith_short_16","alias_value":"ETAOQ2GF2A4UKX6O","created_at":"2026-07-05T02:40:19Z"},{"alias_kind":"pith_short_8","alias_value":"ETAOQ2GF","created_at":"2026-07-05T02:40:19Z"}],"graph_snapshots":[{"event_id":"sha256:114c74d1b4c5c3599e4ab7ece35f8b72047d543ab75e3cdefcb6fdb8fcf2794f","target":"graph","created_at":"2026-07-05T02:40:19Z","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/2010.13851/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Nonlinear amplifiers such as the transistor are ubiquitous in classical technology, but their quantum analogues are not well understood. We introduce a class of nonlinear amplifiers that amplify any normal operator and add only a half-quantum of vacuum noise at the output. In the large-gain limit, when used in conjunction with a noisy linear detector, these amplifiers implement ideal measurements of the normal operator.","authors_text":"Jeffrey M. Epstein, Joshua Combes, K. Birgitta Whaley","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-10-26T19:06:41Z","title":"Quantum limits on noise for a class of nonlinear amplifiers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2010.13851","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:eee5c9268effe8d9a60fa88b28fa07c04ca477893f0d107c8b6e9a5e7a5f01ae","target":"record","created_at":"2026-07-05T02:40:19Z","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":"f5ca743b267bd618e9ca42d6fc925d4d007753047580b7b2a69ffddd8915f328","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-10-26T19:06:41Z","title_canon_sha256":"bc9e3e21e79f6300011f1b1723c8635b1801a34a6d931afbb54eac2f071bf04f"},"schema_version":"1.0","source":{"id":"2010.13851","kind":"arxiv","version":2}},"canonical_sha256":"24c0e868c5d039455fcec7dbf989ff79bb93ceda6b88bf510ae135fc80ed7f91","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"24c0e868c5d039455fcec7dbf989ff79bb93ceda6b88bf510ae135fc80ed7f91","first_computed_at":"2026-07-05T02:40:19.725115Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:40:19.725115Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7X0o1CoDiSHOkED0AooEuDGQIze+muVA6MYIvs3hc6q9kKdsUpPZgJFDTCi0BUZbIsIMVJtVuyVmpiFZlz1KDA==","signature_status":"signed_v1","signed_at":"2026-07-05T02:40:19.725588Z","signed_message":"canonical_sha256_bytes"},"source_id":"2010.13851","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eee5c9268effe8d9a60fa88b28fa07c04ca477893f0d107c8b6e9a5e7a5f01ae","sha256:114c74d1b4c5c3599e4ab7ece35f8b72047d543ab75e3cdefcb6fdb8fcf2794f"],"state_sha256":"62d3039a6621230e6b25a0be66f303f0a34f81140e09b8540fd2bf52d64f4829"}