{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:XVOFYSX52PRHKWOHVLNSAYWRAX","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":"03d45c6963080a0c0186dfcf8dcb6eb4430dfb4810e84450b4ccea82969bff03","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-08-19T15:46:40Z","title_canon_sha256":"213c8f9f54c51d311cff977bec26f32fdc742c9c8dc96e2461db9c8284890afd"},"schema_version":"1.0","source":{"id":"1908.06889","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.06889","created_at":"2026-07-04T23:58:20Z"},{"alias_kind":"arxiv_version","alias_value":"1908.06889v1","created_at":"2026-07-04T23:58:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.06889","created_at":"2026-07-04T23:58:20Z"},{"alias_kind":"pith_short_12","alias_value":"XVOFYSX52PRH","created_at":"2026-07-04T23:58:20Z"},{"alias_kind":"pith_short_16","alias_value":"XVOFYSX52PRHKWOH","created_at":"2026-07-04T23:58:20Z"},{"alias_kind":"pith_short_8","alias_value":"XVOFYSX5","created_at":"2026-07-04T23:58:20Z"}],"graph_snapshots":[{"event_id":"sha256:fcf9ab738f83983f51fb9dfec570b7c7f99f5944c076afbdf9db2ce06c4e15f9","target":"graph","created_at":"2026-07-04T23:58:20Z","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/1908.06889/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In the last few years, several groups have proposed and developed their own platforms demonstrating quantum-limited linear parametric amplification, with evident applications in quantum information and computation, electrical and optical metrology, radio astronomy and basic physics concerning axion detection. Here we propose a short review on the physics behind parametric amplification via metamaterials composed by coplanar wave-guides embedding several Josephson junctions. We present and compare different schemes that exploit the nonlinearity of the Josephson current-phase relation to mix the","authors_text":"Angelo Greco, Emanuele Enrico, Luca Fasolo","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-08-19T15:46:40Z","title":"Superconducting Josephson-based metamaterials for quantum-limited parametric amplification: a review"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.06889","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":"sha256:3fd0d5b9db0365813f5ce8c7954dc8593ab154546c91779a30ccfc8822abcdc3","target":"record","created_at":"2026-07-04T23:58:20Z","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":"03d45c6963080a0c0186dfcf8dcb6eb4430dfb4810e84450b4ccea82969bff03","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-08-19T15:46:40Z","title_canon_sha256":"213c8f9f54c51d311cff977bec26f32fdc742c9c8dc96e2461db9c8284890afd"},"schema_version":"1.0","source":{"id":"1908.06889","kind":"arxiv","version":1}},"canonical_sha256":"bd5c5c4afdd3e27559c7aadb2062d105dd6db42cc85649204882d9e29fe7fe87","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bd5c5c4afdd3e27559c7aadb2062d105dd6db42cc85649204882d9e29fe7fe87","first_computed_at":"2026-07-04T23:58:20.704723Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:58:20.704723Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VGy4TyWrSEp8YZihVrh49OT2NyXRmvZBHrYLpdSyptRhyKECAMwVsDy6l+6Xm5rzYFfAUUf4Qg6NIKI2SKu5Cw==","signature_status":"signed_v1","signed_at":"2026-07-04T23:58:20.705114Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.06889","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3fd0d5b9db0365813f5ce8c7954dc8593ab154546c91779a30ccfc8822abcdc3","sha256:fcf9ab738f83983f51fb9dfec570b7c7f99f5944c076afbdf9db2ce06c4e15f9"],"state_sha256":"edd4d43601ab478469f8c65ca118ed8e1fd1fcb781bd08eec3faee62a5308e85"}