{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:OZHOUKPPCECWKN7WKTARGW3V2P","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":"c619fb1476ea056daaef6d25667c1a9e93395f4a7e7eed16300d28752436edb2","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-03-20T16:24:52Z","title_canon_sha256":"fba5e652975192cbb3a84c7843ccc3cc4f30cec99891392cb7917f1a4eaf8311"},"schema_version":"1.0","source":{"id":"1503.06145","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.06145","created_at":"2026-05-18T02:17:00Z"},{"alias_kind":"arxiv_version","alias_value":"1503.06145v2","created_at":"2026-05-18T02:17:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.06145","created_at":"2026-05-18T02:17:00Z"},{"alias_kind":"pith_short_12","alias_value":"OZHOUKPPCECW","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"OZHOUKPPCECWKN7W","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"OZHOUKPP","created_at":"2026-05-18T12:29:34Z"}],"graph_snapshots":[{"event_id":"sha256:1ec59eb369ef92e7247d41d1c0c2941185f512379bd8f5c1ce53cb896fb67606","target":"graph","created_at":"2026-05-18T02:17:00Z","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":"Coplanar microwave resonators made of 330 nm-thick superconducting YBCO have been realized and characterized in a wide temperature ($T$, 2-100 K) and magnetic field ($B$, 0-7 T) range. The quality factor $Q_L$ exceeds 10$^4$ below 55 K and it slightly decreases for increasing fields, remaining 90$\\%$ of $Q_L(B=0)$ for $B=7$ T and $T=2$ K. These features allow the coherent coupling of resonant photons with a spin ensemble at finite temperature and magnetic field. To demonstrate this, collective strong coupling was achieved by using DPPH organic radical placed at the magnetic antinode of the fun","authors_text":"Alberto Ghirri, Antonio Cassinese, Claudio Bonizzoni, Dario Gerace, Marco Affronte, Samuele Sanna","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-03-20T16:24:52Z","title":"YBCO microwave resonators for strong collective coupling with spin ensembles"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.06145","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":"sha256:987dd6196ef16575050f21e05ed9f8485ff114641cc5c554b7c917d0c7056d5f","target":"record","created_at":"2026-05-18T02:17:00Z","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":"c619fb1476ea056daaef6d25667c1a9e93395f4a7e7eed16300d28752436edb2","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-03-20T16:24:52Z","title_canon_sha256":"fba5e652975192cbb3a84c7843ccc3cc4f30cec99891392cb7917f1a4eaf8311"},"schema_version":"1.0","source":{"id":"1503.06145","kind":"arxiv","version":2}},"canonical_sha256":"764eea29ef11056537f654c1135b75d3d5da779c6e770d36870b161e9f71036f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"764eea29ef11056537f654c1135b75d3d5da779c6e770d36870b161e9f71036f","first_computed_at":"2026-05-18T02:17:00.242773Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:17:00.242773Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EA5MurnyHcaRmCmFpOLHE3+P64gWoXsftBdyqp1+c3YC4qgH0ofupYxhjm6fu6dau+RXBI1OEtbCGMZrjl/9Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:17:00.243382Z","signed_message":"canonical_sha256_bytes"},"source_id":"1503.06145","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:987dd6196ef16575050f21e05ed9f8485ff114641cc5c554b7c917d0c7056d5f","sha256:1ec59eb369ef92e7247d41d1c0c2941185f512379bd8f5c1ce53cb896fb67606"],"state_sha256":"6c61e54c53287292d2700b8306f3d4ce5e8d7640de4d8622175f52462b9ed319"}