{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:ZEJ3FN4LHKMHJH4JWK2PYT2RUJ","short_pith_number":"pith:ZEJ3FN4L","canonical_record":{"source":{"id":"2507.09339","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-07-12T16:38:45Z","cross_cats_sorted":[],"title_canon_sha256":"b2eb99cfb1fa670f68ddfed4eb225263c61bc69200de30af0cd94e35b8918649","abstract_canon_sha256":"a60f85d1cff86a1bd74057829bc1b078a209134126bd7a70791dc82a664c828d"},"schema_version":"1.0"},"canonical_sha256":"c913b2b78b3a98749f89b2b4fc4f51a25209f2e97e9d03379df5c6d7fe4a6499","source":{"kind":"arxiv","id":"2507.09339","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.09339","created_at":"2026-07-05T11:36:07Z"},{"alias_kind":"arxiv_version","alias_value":"2507.09339v1","created_at":"2026-07-05T11:36:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.09339","created_at":"2026-07-05T11:36:07Z"},{"alias_kind":"pith_short_12","alias_value":"ZEJ3FN4LHKMH","created_at":"2026-07-05T11:36:07Z"},{"alias_kind":"pith_short_16","alias_value":"ZEJ3FN4LHKMHJH4J","created_at":"2026-07-05T11:36:07Z"},{"alias_kind":"pith_short_8","alias_value":"ZEJ3FN4L","created_at":"2026-07-05T11:36:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:ZEJ3FN4LHKMHJH4JWK2PYT2RUJ","target":"record","payload":{"canonical_record":{"source":{"id":"2507.09339","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-07-12T16:38:45Z","cross_cats_sorted":[],"title_canon_sha256":"b2eb99cfb1fa670f68ddfed4eb225263c61bc69200de30af0cd94e35b8918649","abstract_canon_sha256":"a60f85d1cff86a1bd74057829bc1b078a209134126bd7a70791dc82a664c828d"},"schema_version":"1.0"},"canonical_sha256":"c913b2b78b3a98749f89b2b4fc4f51a25209f2e97e9d03379df5c6d7fe4a6499","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:36:07.450528Z","signature_b64":"4qqqJ4VhqYHY/bFSaKKc2qvGj0o5mcjf3VjOmOEstWf0M6XeaUoQhhCp6BDGA6YnfPcX5gQM2HWWLClF2LS3Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c913b2b78b3a98749f89b2b4fc4f51a25209f2e97e9d03379df5c6d7fe4a6499","last_reissued_at":"2026-07-05T11:36:07.449998Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:36:07.449998Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2507.09339","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:36:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LhT4qtnfUI1ep+i7F2vLVUOsBfgnvtDTCf8KmpTbJiuoCxntXccJVkyaAZ+8zgF11PuXJA/xdMwAzavNOn5KBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T12:42:48.276236Z"},"content_sha256":"86b3f134ee200214684235f20e147ed0fb9303cb63c579721ea798289d0d54b0","schema_version":"1.0","event_id":"sha256:86b3f134ee200214684235f20e147ed0fb9303cb63c579721ea798289d0d54b0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:ZEJ3FN4LHKMHJH4JWK2PYT2RUJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Superinductor-based ultrastrong coupling in a superconducting circuit","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alba Torras-Coloma, Ariadna G\\'omez-del-Pulgar-Mart\\'inez, Elia Bertoldo, Luca Cozzolino, P. Forn-D\\'iaz","submitted_at":"2025-07-12T16:38:45Z","abstract_excerpt":"We present an ultrastrong superinductor-based coupling consisting of a flux qubit galvanically coupled to a resonator. The coupling inductor is fabricated in granular Aluminum, a superinductor material able to provide large surface inductances. Spectroscopy measurements on the qubit-resonator system reveal a Bloch-Siegert shift of \\SI{23}{\\mega\\hertz} and a coupling fraction of $g/\\omega_r \\simeq 0.13$, entering the perturbative ultrastrong coupling (USC) regime. We estimate the inductance of the coupler independently by low-temperature resistance measurements providing $L_c = (0.74\\pm0.14)\\,\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.09339","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2507.09339/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:36:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/GfxvFnV8dIrRa9FSuNJ3p+RZTM1NmCZBGEapOzALDJrQy1s0/oYk/Y1IT73as2Ng3bMbgnziRx5Z5V8ShoIBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T12:42:48.276738Z"},"content_sha256":"289d50b489c37e4b2c380fcdd2807e47815ac3a38d96c697df032bb6c88e359e","schema_version":"1.0","event_id":"sha256:289d50b489c37e4b2c380fcdd2807e47815ac3a38d96c697df032bb6c88e359e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZEJ3FN4LHKMHJH4JWK2PYT2RUJ/bundle.json","state_url":"https://pith.science/pith/ZEJ3FN4LHKMHJH4JWK2PYT2RUJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZEJ3FN4LHKMHJH4JWK2PYT2RUJ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-04T12:42:48Z","links":{"resolver":"https://pith.science/pith/ZEJ3FN4LHKMHJH4JWK2PYT2RUJ","bundle":"https://pith.science/pith/ZEJ3FN4LHKMHJH4JWK2PYT2RUJ/bundle.json","state":"https://pith.science/pith/ZEJ3FN4LHKMHJH4JWK2PYT2RUJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZEJ3FN4LHKMHJH4JWK2PYT2RUJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:ZEJ3FN4LHKMHJH4JWK2PYT2RUJ","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":"a60f85d1cff86a1bd74057829bc1b078a209134126bd7a70791dc82a664c828d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-07-12T16:38:45Z","title_canon_sha256":"b2eb99cfb1fa670f68ddfed4eb225263c61bc69200de30af0cd94e35b8918649"},"schema_version":"1.0","source":{"id":"2507.09339","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.09339","created_at":"2026-07-05T11:36:07Z"},{"alias_kind":"arxiv_version","alias_value":"2507.09339v1","created_at":"2026-07-05T11:36:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.09339","created_at":"2026-07-05T11:36:07Z"},{"alias_kind":"pith_short_12","alias_value":"ZEJ3FN4LHKMH","created_at":"2026-07-05T11:36:07Z"},{"alias_kind":"pith_short_16","alias_value":"ZEJ3FN4LHKMHJH4J","created_at":"2026-07-05T11:36:07Z"},{"alias_kind":"pith_short_8","alias_value":"ZEJ3FN4L","created_at":"2026-07-05T11:36:07Z"}],"graph_snapshots":[{"event_id":"sha256:289d50b489c37e4b2c380fcdd2807e47815ac3a38d96c697df032bb6c88e359e","target":"graph","created_at":"2026-07-05T11:36:07Z","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/2507.09339/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present an ultrastrong superinductor-based coupling consisting of a flux qubit galvanically coupled to a resonator. The coupling inductor is fabricated in granular Aluminum, a superinductor material able to provide large surface inductances. Spectroscopy measurements on the qubit-resonator system reveal a Bloch-Siegert shift of \\SI{23}{\\mega\\hertz} and a coupling fraction of $g/\\omega_r \\simeq 0.13$, entering the perturbative ultrastrong coupling (USC) regime. We estimate the inductance of the coupler independently by low-temperature resistance measurements providing $L_c = (0.74\\pm0.14)\\,\\","authors_text":"Alba Torras-Coloma, Ariadna G\\'omez-del-Pulgar-Mart\\'inez, Elia Bertoldo, Luca Cozzolino, P. Forn-D\\'iaz","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-07-12T16:38:45Z","title":"Superinductor-based ultrastrong coupling in a superconducting circuit"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.09339","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":"sha256:86b3f134ee200214684235f20e147ed0fb9303cb63c579721ea798289d0d54b0","target":"record","created_at":"2026-07-05T11:36:07Z","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":"a60f85d1cff86a1bd74057829bc1b078a209134126bd7a70791dc82a664c828d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2025-07-12T16:38:45Z","title_canon_sha256":"b2eb99cfb1fa670f68ddfed4eb225263c61bc69200de30af0cd94e35b8918649"},"schema_version":"1.0","source":{"id":"2507.09339","kind":"arxiv","version":1}},"canonical_sha256":"c913b2b78b3a98749f89b2b4fc4f51a25209f2e97e9d03379df5c6d7fe4a6499","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c913b2b78b3a98749f89b2b4fc4f51a25209f2e97e9d03379df5c6d7fe4a6499","first_computed_at":"2026-07-05T11:36:07.449998Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:36:07.449998Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4qqqJ4VhqYHY/bFSaKKc2qvGj0o5mcjf3VjOmOEstWf0M6XeaUoQhhCp6BDGA6YnfPcX5gQM2HWWLClF2LS3Aw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:36:07.450528Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.09339","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:86b3f134ee200214684235f20e147ed0fb9303cb63c579721ea798289d0d54b0","sha256:289d50b489c37e4b2c380fcdd2807e47815ac3a38d96c697df032bb6c88e359e"],"state_sha256":"5f0d3650d281bf171c74fd227ddded2959fdfd1568ebb803d3deb587224db764"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"astq2rhtjXN5I8ox6tBON1QSWiKbaVbkfz+W1RMn2UfMo3jnxkDkwQPtmb/XFtbh6jXGQKvY6UF/hnSkFwzBDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T12:42:48.281013Z","bundle_sha256":"5b3bb9534a1e78c0801508632406baa4b99f4a90f7c6b3f8de786e557284a453"}}