{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:ACO42GFOVTO23BNYN73QKH7GLR","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":"0f655c807982d59601b2c5f736fb06c75e139838c979a035ed370debd4666a07","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2012-06-11T14:45:11Z","title_canon_sha256":"9ee68203ff271436b1d44f9691b3224620020bbbc13e4ed64315ef5bb8f3fb86"},"schema_version":"1.0","source":{"id":"1206.2235","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1206.2235","created_at":"2026-05-18T01:56:59Z"},{"alias_kind":"arxiv_version","alias_value":"1206.2235v2","created_at":"2026-05-18T01:56:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1206.2235","created_at":"2026-05-18T01:56:59Z"},{"alias_kind":"pith_short_12","alias_value":"ACO42GFOVTO2","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"ACO42GFOVTO23BNY","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"ACO42GFO","created_at":"2026-05-18T12:26:58Z"}],"graph_snapshots":[{"event_id":"sha256:5f0231d4e1bd8af56d3c6bed9e56ad1abf5a6bf75da69197c483a4478821a443","target":"graph","created_at":"2026-05-18T01:56:59Z","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 present measurements of an amplifier operating at 3.8 GHz with 150 MHz of bandwidth based on the microstrip input-coil resonance of a dc superconducting quantum interference device (SQUID) with submicron Josephson junctions. The noise temperature is measured using two methods: comparing the signal-to-noise ratio of the system with and without the SQUID in the amplifier chain, and using a modified Y-factor technique where calibrated narrowband noise is mixed up to the SQUID amplifier operating frequency. With the SQUID cooled to 0.35 K we observe a minimum system noise temperature of 0.55 $\\","authors_text":"B. L. T. Plourde, M. P. DeFeo","cross_cats":["physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2012-06-11T14:45:11Z","title":"Superconducting microstrip amplifiers with sub-Kelvin noise temperature near 4 GHz"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1206.2235","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":"sha256:809430da7afde2b26a27dc968119744d5c3f583f0845a36934462ad19e4c1882","target":"record","created_at":"2026-05-18T01:56:59Z","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":"0f655c807982d59601b2c5f736fb06c75e139838c979a035ed370debd4666a07","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2012-06-11T14:45:11Z","title_canon_sha256":"9ee68203ff271436b1d44f9691b3224620020bbbc13e4ed64315ef5bb8f3fb86"},"schema_version":"1.0","source":{"id":"1206.2235","kind":"arxiv","version":2}},"canonical_sha256":"009dcd18aeacddad85b86ff7051fe65c5c7ba497a0ff7a787f58e62cc01f14e8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"009dcd18aeacddad85b86ff7051fe65c5c7ba497a0ff7a787f58e62cc01f14e8","first_computed_at":"2026-05-18T01:56:59.890294Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:56:59.890294Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TJXW0v1MZSGjxPZMCTUdhKAARTrNHk9dFKvjqX0Rim6gsv/kLBYxPoXqYqfOGxQseEJM+5m1J8TBKCpr2iBWCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:56:59.890764Z","signed_message":"canonical_sha256_bytes"},"source_id":"1206.2235","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:809430da7afde2b26a27dc968119744d5c3f583f0845a36934462ad19e4c1882","sha256:5f0231d4e1bd8af56d3c6bed9e56ad1abf5a6bf75da69197c483a4478821a443"],"state_sha256":"745b5bd464a5b0d45ee41a74b97232d544653c87fdaeee00c904f74b21050ca8"}