{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:KSNNTVDCVKQFSDHN4QC7XZK4OY","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":"2bd8851f014c8da9a8596517e1019dfa72ae2b3bdd07efa499ce3f739a78eacd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-06-01T20:18:18Z","title_canon_sha256":"a599f665367ccadfa3027b61a885189e30e28c02cb6a00d0003c47b726313cc0"},"schema_version":"1.0","source":{"id":"1406.0197","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.0197","created_at":"2026-05-18T02:50:41Z"},{"alias_kind":"arxiv_version","alias_value":"1406.0197v1","created_at":"2026-05-18T02:50:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.0197","created_at":"2026-05-18T02:50:41Z"},{"alias_kind":"pith_short_12","alias_value":"KSNNTVDCVKQF","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_16","alias_value":"KSNNTVDCVKQFSDHN","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_8","alias_value":"KSNNTVDC","created_at":"2026-05-18T12:28:35Z"}],"graph_snapshots":[{"event_id":"sha256:21e8afd81cf0f2abc98736e0246655c5e2156a8f7a81905741a6f2855151594e","target":"graph","created_at":"2026-05-18T02:50:41Z","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":"The fundamental noise limit of a phase-preserving amplifier at frequency $\\omega /2\\pi $ is the standard quantum limit $T_{q}=\\hbar \\omega /2k_{B}$. In the microwave range, the best candidates have been amplifiers based on superconducting quantum interference devices (reaching the noise temperature $T_{n} \\sim 1.8 T_{q}$ at 700 MHz), and non-degenerate parametric amplifiers (reaching noise levels close to the quantum limit $T_{n}\\approx T_{q}$ at 8 GHz). We introduce a new type of an amplifier based on the negative resistance of a selectively damped Josephson junction. Noise performance of our","authors_text":"Heikki Sepp\\\"a, Juha Hassel, Pasi L\\\"ahteenm\\\"aki, Pertti Hakonen, Visa Vesterinen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-06-01T20:18:18Z","title":"Josephson junction microwave amplifier in self-organized noise compression mode"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.0197","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:dc6ffe806f7af1c87b18f28e8d4ad7eb36faa6d28dd90600556118164eafb599","target":"record","created_at":"2026-05-18T02:50:41Z","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":"2bd8851f014c8da9a8596517e1019dfa72ae2b3bdd07efa499ce3f739a78eacd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-06-01T20:18:18Z","title_canon_sha256":"a599f665367ccadfa3027b61a885189e30e28c02cb6a00d0003c47b726313cc0"},"schema_version":"1.0","source":{"id":"1406.0197","kind":"arxiv","version":1}},"canonical_sha256":"549ad9d462aaa0590cede405fbe55c7609fe2de0ba824d6c39fc14b93a549d9f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"549ad9d462aaa0590cede405fbe55c7609fe2de0ba824d6c39fc14b93a549d9f","first_computed_at":"2026-05-18T02:50:41.535722Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:50:41.535722Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9ohCJpS1r89Hzz7rbuqCNk5XgeXA5E2ZFdGF/XFFKgbTx/vcfcFwuR9nAnD/1s0r5Dnl5uYgs52FCxJyv0zyDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:50:41.536178Z","signed_message":"canonical_sha256_bytes"},"source_id":"1406.0197","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dc6ffe806f7af1c87b18f28e8d4ad7eb36faa6d28dd90600556118164eafb599","sha256:21e8afd81cf0f2abc98736e0246655c5e2156a8f7a81905741a6f2855151594e"],"state_sha256":"fb21d56998cdeb7fc63e0123dc12961a333e8924decd5208405b191391b0c5fd"}