{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:X4JPBVJ6Z75ONGH5IAVWOLZQEF","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":"bb27c04f7a513e1c7c29ab56eeb13b0d71c7a8170a283776fe6b905c6b84bc4f","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2012-11-09T00:02:08Z","title_canon_sha256":"ef3dea6d12365a4bc72c40028b4b92d95798114b6de67f13cc66cf72d6451599"},"schema_version":"1.0","source":{"id":"1211.2017","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1211.2017","created_at":"2026-05-18T01:53:17Z"},{"alias_kind":"arxiv_version","alias_value":"1211.2017v1","created_at":"2026-05-18T01:53:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1211.2017","created_at":"2026-05-18T01:53:17Z"},{"alias_kind":"pith_short_12","alias_value":"X4JPBVJ6Z75O","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_16","alias_value":"X4JPBVJ6Z75ONGH5","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_8","alias_value":"X4JPBVJ6","created_at":"2026-05-18T12:27:27Z"}],"graph_snapshots":[{"event_id":"sha256:fb01d3c035cd17b599c641c65e1996b650ab47b7ef9c38be67a334926d634066","target":"graph","created_at":"2026-05-18T01:53:17Z","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 a superconducting qubit design that is fabricated in a 2D geometry over a superconducting ground plane to enhance the lifetime. The qubit is coupled to a microstrip resonator for readout. The circuit is fabricated on a silicon substrate using low loss, stoichiometric titanium nitride for capacitor pads and small, shadow-evaporated aluminum/aluminum-oxide junctions. We observe qubit relaxation and coherence times ($T_1$ and $T_2$) of 11.7 $\\pm$ 0.2 $\\mu$s and 8.7 $\\pm$ 0.3 $\\mu$s, respectively. Calculations show that the proximity of the superconducting plane suppresses the otherwise","authors_text":"David P. Pappas, Jiansong Gao, Jose Aumentado, Martin Sandberg, Martin Weides, Michael R. Vissers, Tom Ohki","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2012-11-09T00:02:08Z","title":"Long-lived, radiation-suppressed superconducting quantum bit in a planar geometry"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.2017","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:e1528da255275c15f74a966f42810f191d24f4f6e41dcc6a338c424ec1e80256","target":"record","created_at":"2026-05-18T01:53:17Z","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":"bb27c04f7a513e1c7c29ab56eeb13b0d71c7a8170a283776fe6b905c6b84bc4f","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2012-11-09T00:02:08Z","title_canon_sha256":"ef3dea6d12365a4bc72c40028b4b92d95798114b6de67f13cc66cf72d6451599"},"schema_version":"1.0","source":{"id":"1211.2017","kind":"arxiv","version":1}},"canonical_sha256":"bf12f0d53ecffae698fd402b672f30216f32073e2de35a3bc51b2f3fe640c261","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bf12f0d53ecffae698fd402b672f30216f32073e2de35a3bc51b2f3fe640c261","first_computed_at":"2026-05-18T01:53:17.697160Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:53:17.697160Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XLdlnKM3Sd1mPdmdGh1V/AJGEvg6k+OiqRShuWGb4JNjAv1OZLJgNIpLJZV74oASbrPp+Tq3DeMFDUMhZqa7DQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:53:17.697781Z","signed_message":"canonical_sha256_bytes"},"source_id":"1211.2017","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e1528da255275c15f74a966f42810f191d24f4f6e41dcc6a338c424ec1e80256","sha256:fb01d3c035cd17b599c641c65e1996b650ab47b7ef9c38be67a334926d634066"],"state_sha256":"630c2e228f0f4a4d12533df9042fb9aea261a0e3ef4a84e28e41ddee3d0c8c9f"}