{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:Q4EPSYR2XU7QT7HOSKGTZ6A3T6","short_pith_number":"pith:Q4EPSYR2","canonical_record":{"source":{"id":"0708.0230","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2007-08-01T20:58:01Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"05fdea3511f67143ccc7c6f5b7aadf435874fba7e634a1d7bc1347ae51c531b4","abstract_canon_sha256":"30c67741c21098c77d9556f9e5edec2d1d065500698ae9877746addd957b46d5"},"schema_version":"1.0"},"canonical_sha256":"8708f9623abd3f09fcee928d3cf81b9fa89a037a4ac341c77b072469569fd493","source":{"kind":"arxiv","id":"0708.0230","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0708.0230","created_at":"2026-05-18T02:16:28Z"},{"alias_kind":"arxiv_version","alias_value":"0708.0230v1","created_at":"2026-05-18T02:16:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0708.0230","created_at":"2026-05-18T02:16:28Z"},{"alias_kind":"pith_short_12","alias_value":"Q4EPSYR2XU7Q","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_16","alias_value":"Q4EPSYR2XU7QT7HO","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_8","alias_value":"Q4EPSYR2","created_at":"2026-05-18T12:25:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:Q4EPSYR2XU7QT7HOSKGTZ6A3T6","target":"record","payload":{"canonical_record":{"source":{"id":"0708.0230","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2007-08-01T20:58:01Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"05fdea3511f67143ccc7c6f5b7aadf435874fba7e634a1d7bc1347ae51c531b4","abstract_canon_sha256":"30c67741c21098c77d9556f9e5edec2d1d065500698ae9877746addd957b46d5"},"schema_version":"1.0"},"canonical_sha256":"8708f9623abd3f09fcee928d3cf81b9fa89a037a4ac341c77b072469569fd493","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:16:28.967288Z","signature_b64":"jRLQBYG0ayHgUdsJfy+HWYZgniETE3HfTlVmK3i/ud/u/s1TAG5Hfi6m4Z+XAedE/0haKZuc0PWI0hrTmu7vCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8708f9623abd3f09fcee928d3cf81b9fa89a037a4ac341c77b072469569fd493","last_reissued_at":"2026-05-18T02:16:28.965973Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:16:28.965973Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0708.0230","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":"2026-05-18T02:16:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KDb+pSlvmSjh4edguLQH0eEDI2Aiw9AILK8xb+vxzxtD+MWGUh3x3QdaZ+BeZyXrZlkVC5HsTIGjQ5LwtUcXBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T22:31:44.335534Z"},"content_sha256":"9c39920b72c22b6d81cca341c32d0fca083c31b645991ba9a7f605e7f8cc79cc","schema_version":"1.0","event_id":"sha256:9c39920b72c22b6d81cca341c32d0fca083c31b645991ba9a7f605e7f8cc79cc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:Q4EPSYR2XU7QT7HOSKGTZ6A3T6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Imaging spontaneous currents in superconducting arrays of pi-junctions","license":"","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"cond-mat.supr-con","authors_text":"Adele Ruosi, Carmine Granata, Dale J. Van Harlingen, Maurizio Russo, Micah J.A. Stoutimore, Sergey M. Frolov, Trevis A. Crane, Valery V. Ryazanov, Vladimir A. Oboznov","submitted_at":"2007-08-01T20:58:01Z","abstract_excerpt":"Superconductors separated by a thin tunneling barrier exhibit the Josephson effect that allows charge transport at zero voltage, typically with no phase shift between the superconductors in the lowest energy state. Recently, Josephson junctions with ground state phase shifts of pi proposed by theory three decades ago have been demonstrated. In superconducting loops, pi-junctions cause spontaneous circulation of persistent currents in zero magnetic field, analogous to spin-1/2 systems. Here we image the spontaneous zero-field currents in superconducting networks of temperature-controlled pi-jun"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0708.0230","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":""},"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":"2026-05-18T02:16:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jVZ6Hghh06IeRDa0LWfdunB8yaHRpD2/Ck+ur+HOTSGagvr7Eulub1pClEUPFXvIeMdvJrQgNmSQNIFNC/X0AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T22:31:44.336196Z"},"content_sha256":"ea1776853516a81f99b57272307b5656aae2d8b4378f4c75f96c5746bb92b155","schema_version":"1.0","event_id":"sha256:ea1776853516a81f99b57272307b5656aae2d8b4378f4c75f96c5746bb92b155"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Q4EPSYR2XU7QT7HOSKGTZ6A3T6/bundle.json","state_url":"https://pith.science/pith/Q4EPSYR2XU7QT7HOSKGTZ6A3T6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Q4EPSYR2XU7QT7HOSKGTZ6A3T6/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":"2026-05-25T22:31:44Z","links":{"resolver":"https://pith.science/pith/Q4EPSYR2XU7QT7HOSKGTZ6A3T6","bundle":"https://pith.science/pith/Q4EPSYR2XU7QT7HOSKGTZ6A3T6/bundle.json","state":"https://pith.science/pith/Q4EPSYR2XU7QT7HOSKGTZ6A3T6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Q4EPSYR2XU7QT7HOSKGTZ6A3T6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:Q4EPSYR2XU7QT7HOSKGTZ6A3T6","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":"30c67741c21098c77d9556f9e5edec2d1d065500698ae9877746addd957b46d5","cross_cats_sorted":["cond-mat.mes-hall"],"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2007-08-01T20:58:01Z","title_canon_sha256":"05fdea3511f67143ccc7c6f5b7aadf435874fba7e634a1d7bc1347ae51c531b4"},"schema_version":"1.0","source":{"id":"0708.0230","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0708.0230","created_at":"2026-05-18T02:16:28Z"},{"alias_kind":"arxiv_version","alias_value":"0708.0230v1","created_at":"2026-05-18T02:16:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0708.0230","created_at":"2026-05-18T02:16:28Z"},{"alias_kind":"pith_short_12","alias_value":"Q4EPSYR2XU7Q","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_16","alias_value":"Q4EPSYR2XU7QT7HO","created_at":"2026-05-18T12:25:55Z"},{"alias_kind":"pith_short_8","alias_value":"Q4EPSYR2","created_at":"2026-05-18T12:25:55Z"}],"graph_snapshots":[{"event_id":"sha256:ea1776853516a81f99b57272307b5656aae2d8b4378f4c75f96c5746bb92b155","target":"graph","created_at":"2026-05-18T02:16:28Z","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":"Superconductors separated by a thin tunneling barrier exhibit the Josephson effect that allows charge transport at zero voltage, typically with no phase shift between the superconductors in the lowest energy state. Recently, Josephson junctions with ground state phase shifts of pi proposed by theory three decades ago have been demonstrated. In superconducting loops, pi-junctions cause spontaneous circulation of persistent currents in zero magnetic field, analogous to spin-1/2 systems. Here we image the spontaneous zero-field currents in superconducting networks of temperature-controlled pi-jun","authors_text":"Adele Ruosi, Carmine Granata, Dale J. Van Harlingen, Maurizio Russo, Micah J.A. Stoutimore, Sergey M. Frolov, Trevis A. Crane, Valery V. Ryazanov, Vladimir A. Oboznov","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2007-08-01T20:58:01Z","title":"Imaging spontaneous currents in superconducting arrays of pi-junctions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0708.0230","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":"sha256:9c39920b72c22b6d81cca341c32d0fca083c31b645991ba9a7f605e7f8cc79cc","target":"record","created_at":"2026-05-18T02:16:28Z","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":"30c67741c21098c77d9556f9e5edec2d1d065500698ae9877746addd957b46d5","cross_cats_sorted":["cond-mat.mes-hall"],"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2007-08-01T20:58:01Z","title_canon_sha256":"05fdea3511f67143ccc7c6f5b7aadf435874fba7e634a1d7bc1347ae51c531b4"},"schema_version":"1.0","source":{"id":"0708.0230","kind":"arxiv","version":1}},"canonical_sha256":"8708f9623abd3f09fcee928d3cf81b9fa89a037a4ac341c77b072469569fd493","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8708f9623abd3f09fcee928d3cf81b9fa89a037a4ac341c77b072469569fd493","first_computed_at":"2026-05-18T02:16:28.965973Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:16:28.965973Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jRLQBYG0ayHgUdsJfy+HWYZgniETE3HfTlVmK3i/ud/u/s1TAG5Hfi6m4Z+XAedE/0haKZuc0PWI0hrTmu7vCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:16:28.967288Z","signed_message":"canonical_sha256_bytes"},"source_id":"0708.0230","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9c39920b72c22b6d81cca341c32d0fca083c31b645991ba9a7f605e7f8cc79cc","sha256:ea1776853516a81f99b57272307b5656aae2d8b4378f4c75f96c5746bb92b155"],"state_sha256":"fc4eb0e834c7e93890c1be16cebc4f225403cef98e12f62df1e67fcad342e730"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FbFeM91o6kVaqc187Ktek72jCVp93gyuzWt/FBveFl3Hfg3ubWJvIz+8HpF2Htg+9HsowR8qi8JcL+lD2PjrDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T22:31:44.339258Z","bundle_sha256":"4dffc355ccb2b64278a70698f8f1054bc5fdd39b047a5ba2bbedf1f2e3ffc84f"}}