{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:U2SH66YPONECBYPMDTYVWAQ3T3","short_pith_number":"pith:U2SH66YP","canonical_record":{"source":{"id":"1902.00063","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-01-31T20:41:12Z","cross_cats_sorted":["cond-mat.mes-hall","quant-ph"],"title_canon_sha256":"0115310b02fc01fe92d7af90a2b9013552a67795dc6eb75f4bdb01766bb68b6d","abstract_canon_sha256":"502d68827a2c0e46426b71887b3a0136791b70660e322430fd6d1768023a0d47"},"schema_version":"1.0"},"canonical_sha256":"a6a47f7b0f734820e1ec1cf15b021b9ee33041026af7fc10d3a7cf6ebd4ebd1e","source":{"kind":"arxiv","id":"1902.00063","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.00063","created_at":"2026-05-17T23:46:28Z"},{"alias_kind":"arxiv_version","alias_value":"1902.00063v2","created_at":"2026-05-17T23:46:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.00063","created_at":"2026-05-17T23:46:28Z"},{"alias_kind":"pith_short_12","alias_value":"U2SH66YPONEC","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"U2SH66YPONECBYPM","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"U2SH66YP","created_at":"2026-05-18T12:33:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:U2SH66YPONECBYPMDTYVWAQ3T3","target":"record","payload":{"canonical_record":{"source":{"id":"1902.00063","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-01-31T20:41:12Z","cross_cats_sorted":["cond-mat.mes-hall","quant-ph"],"title_canon_sha256":"0115310b02fc01fe92d7af90a2b9013552a67795dc6eb75f4bdb01766bb68b6d","abstract_canon_sha256":"502d68827a2c0e46426b71887b3a0136791b70660e322430fd6d1768023a0d47"},"schema_version":"1.0"},"canonical_sha256":"a6a47f7b0f734820e1ec1cf15b021b9ee33041026af7fc10d3a7cf6ebd4ebd1e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:46:28.960503Z","signature_b64":"DBIsKwCPydRE7anAPTQVybzQvQ+deLxy6wbrRdomHh51femAJzegLvGzMrjoAqLdOsMNEuEJI7hFnLfTyXBRAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a6a47f7b0f734820e1ec1cf15b021b9ee33041026af7fc10d3a7cf6ebd4ebd1e","last_reissued_at":"2026-05-17T23:46:28.959849Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:46:28.959849Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1902.00063","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:46:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nCPKleTIIYtGLZxJh6wgeq1uhm3wAdIBHhwltJKWkzAtW9rDyV+rlIo5a3A1TpK3K9iAff+IVWBxvvggncq8Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T05:26:05.589816Z"},"content_sha256":"8be10353147cc3632dd4f03f795d9a1f4bfc7d7d9c4216cce069ea4a0f4b002b","schema_version":"1.0","event_id":"sha256:8be10353147cc3632dd4f03f795d9a1f4bfc7d7d9c4216cce069ea4a0f4b002b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:U2SH66YPONECBYPMDTYVWAQ3T3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Superconducting quantum refrigerator: Breaking and rejoining Cooper pairs with magnetic field cycles","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall","quant-ph"],"primary_cat":"cond-mat.supr-con","authors_text":"Andrew N. Jordan, Francesco Giazotto, Sreenath K. Manikandan","submitted_at":"2019-01-31T20:41:12Z","abstract_excerpt":"We propose a solid state refrigeration technique based on repeated adiabatic magnetization/demagnetization cycles of a superconductor which acts as the working substance. The gradual cooling down of a substrate (normal metal) in contact with the working substance is demonstrated for different initial temperatures of the substrate. Excess heat is given to a hot large-gap superconductor. The on-chip refrigerator works in a cyclic manner because of an effective thermal switching mechanism: Heat transport between N/N versus N/S junctions is asymmetric because of the appearance of the energy gap. T"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.00063","kind":"arxiv","version":2},"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":"2026-05-17T23:46:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/48jzxGdaMLkRkw6zIyMXIKiTMmmKjqBmq/ewLx4z2j9TZgM0+MqMiH46JYMPZV/1tGDSFzH4zAJfGkjh8zeAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T05:26:05.590467Z"},"content_sha256":"2cab7a101ac827047f17bca64d139e8cd2689e2bf838453e056e7e5305df79f3","schema_version":"1.0","event_id":"sha256:2cab7a101ac827047f17bca64d139e8cd2689e2bf838453e056e7e5305df79f3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/U2SH66YPONECBYPMDTYVWAQ3T3/bundle.json","state_url":"https://pith.science/pith/U2SH66YPONECBYPMDTYVWAQ3T3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/U2SH66YPONECBYPMDTYVWAQ3T3/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":"2026-06-06T05:26:05Z","links":{"resolver":"https://pith.science/pith/U2SH66YPONECBYPMDTYVWAQ3T3","bundle":"https://pith.science/pith/U2SH66YPONECBYPMDTYVWAQ3T3/bundle.json","state":"https://pith.science/pith/U2SH66YPONECBYPMDTYVWAQ3T3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/U2SH66YPONECBYPMDTYVWAQ3T3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:U2SH66YPONECBYPMDTYVWAQ3T3","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":"502d68827a2c0e46426b71887b3a0136791b70660e322430fd6d1768023a0d47","cross_cats_sorted":["cond-mat.mes-hall","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-01-31T20:41:12Z","title_canon_sha256":"0115310b02fc01fe92d7af90a2b9013552a67795dc6eb75f4bdb01766bb68b6d"},"schema_version":"1.0","source":{"id":"1902.00063","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.00063","created_at":"2026-05-17T23:46:28Z"},{"alias_kind":"arxiv_version","alias_value":"1902.00063v2","created_at":"2026-05-17T23:46:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.00063","created_at":"2026-05-17T23:46:28Z"},{"alias_kind":"pith_short_12","alias_value":"U2SH66YPONEC","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"U2SH66YPONECBYPM","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"U2SH66YP","created_at":"2026-05-18T12:33:30Z"}],"graph_snapshots":[{"event_id":"sha256:2cab7a101ac827047f17bca64d139e8cd2689e2bf838453e056e7e5305df79f3","target":"graph","created_at":"2026-05-17T23:46:28Z","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":"We propose a solid state refrigeration technique based on repeated adiabatic magnetization/demagnetization cycles of a superconductor which acts as the working substance. The gradual cooling down of a substrate (normal metal) in contact with the working substance is demonstrated for different initial temperatures of the substrate. Excess heat is given to a hot large-gap superconductor. The on-chip refrigerator works in a cyclic manner because of an effective thermal switching mechanism: Heat transport between N/N versus N/S junctions is asymmetric because of the appearance of the energy gap. T","authors_text":"Andrew N. Jordan, Francesco Giazotto, Sreenath K. Manikandan","cross_cats":["cond-mat.mes-hall","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-01-31T20:41:12Z","title":"Superconducting quantum refrigerator: Breaking and rejoining Cooper pairs with magnetic field cycles"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.00063","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":"sha256:8be10353147cc3632dd4f03f795d9a1f4bfc7d7d9c4216cce069ea4a0f4b002b","target":"record","created_at":"2026-05-17T23:46:28Z","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":"502d68827a2c0e46426b71887b3a0136791b70660e322430fd6d1768023a0d47","cross_cats_sorted":["cond-mat.mes-hall","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-01-31T20:41:12Z","title_canon_sha256":"0115310b02fc01fe92d7af90a2b9013552a67795dc6eb75f4bdb01766bb68b6d"},"schema_version":"1.0","source":{"id":"1902.00063","kind":"arxiv","version":2}},"canonical_sha256":"a6a47f7b0f734820e1ec1cf15b021b9ee33041026af7fc10d3a7cf6ebd4ebd1e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a6a47f7b0f734820e1ec1cf15b021b9ee33041026af7fc10d3a7cf6ebd4ebd1e","first_computed_at":"2026-05-17T23:46:28.959849Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:46:28.959849Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DBIsKwCPydRE7anAPTQVybzQvQ+deLxy6wbrRdomHh51femAJzegLvGzMrjoAqLdOsMNEuEJI7hFnLfTyXBRAQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:46:28.960503Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.00063","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8be10353147cc3632dd4f03f795d9a1f4bfc7d7d9c4216cce069ea4a0f4b002b","sha256:2cab7a101ac827047f17bca64d139e8cd2689e2bf838453e056e7e5305df79f3"],"state_sha256":"ad5cced286e0362a1f95664501c5e3fae0e78c17921c24dc56d456ff87cedaf1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"09ufbbWXdCs7qoRJUNXpsnT/ovEYSs6j7CjixhOmJ8AR7x8ir54O2F5kTsRkLwe3Y+Nmcire1EhbQIv4R2LxAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T05:26:05.594000Z","bundle_sha256":"dea236cde5d72a47a8ff63c4fbc03d99b3bfc0d0b7062a38eebe671aee3dfa9d"}}