{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:SPD5R6Q7Y76UTNQVOWADVUKDTW","short_pith_number":"pith:SPD5R6Q7","canonical_record":{"source":{"id":"2606.28199","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-06-26T15:48:19Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"971a07dc10a182b6ddc031b1f0f03462c37090db86b5a66537f71d542e7adf50","abstract_canon_sha256":"055b0d07084829a24f263baa10f8f30a5e8b4ad98acbabf836f5767fb7d9dc8d"},"schema_version":"1.0"},"canonical_sha256":"93c7d8fa1fc7fd49b61575803ad1439dbd1e16f7f01e5ab7f1697de45450cac8","source":{"kind":"arxiv","id":"2606.28199","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.28199","created_at":"2026-06-29T01:15:09Z"},{"alias_kind":"arxiv_version","alias_value":"2606.28199v1","created_at":"2026-06-29T01:15:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.28199","created_at":"2026-06-29T01:15:09Z"},{"alias_kind":"pith_short_12","alias_value":"SPD5R6Q7Y76U","created_at":"2026-06-29T01:15:09Z"},{"alias_kind":"pith_short_16","alias_value":"SPD5R6Q7Y76UTNQV","created_at":"2026-06-29T01:15:09Z"},{"alias_kind":"pith_short_8","alias_value":"SPD5R6Q7","created_at":"2026-06-29T01:15:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:SPD5R6Q7Y76UTNQVOWADVUKDTW","target":"record","payload":{"canonical_record":{"source":{"id":"2606.28199","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-06-26T15:48:19Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"971a07dc10a182b6ddc031b1f0f03462c37090db86b5a66537f71d542e7adf50","abstract_canon_sha256":"055b0d07084829a24f263baa10f8f30a5e8b4ad98acbabf836f5767fb7d9dc8d"},"schema_version":"1.0"},"canonical_sha256":"93c7d8fa1fc7fd49b61575803ad1439dbd1e16f7f01e5ab7f1697de45450cac8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-29T01:15:09.054753Z","signature_b64":"D0Di7L7dBYgrCjFhO3R9vXeABe4uUu3hsOkKzIgiFXIM+6KTiTzyM7LHgDH+0xdCeLOauaeliSe/HnIHr2aXCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"93c7d8fa1fc7fd49b61575803ad1439dbd1e16f7f01e5ab7f1697de45450cac8","last_reissued_at":"2026-06-29T01:15:09.054335Z","signature_status":"signed_v1","first_computed_at":"2026-06-29T01:15:09.054335Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.28199","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":"2026-06-29T01:15:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"J+iN24OAZ0Qmpd5PBiKZTYdSB0UTwVwwPMGUzlwUCn+n0UyID72DHEtqw8cK27bwVWG41QIoAYbDOIP5VxArBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T18:23:56.020759Z"},"content_sha256":"badb6af0ab93f6d58890d1b2a3e8dae98ff355db9a3efd8349d5604bab881716","schema_version":"1.0","event_id":"sha256:badb6af0ab93f6d58890d1b2a3e8dae98ff355db9a3efd8349d5604bab881716"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:SPD5R6Q7Y76UTNQVOWADVUKDTW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hybrid quantum-classical neural network for sample-efficient recognition of topological phases","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"quant-ph","authors_text":"Christoph Hellings, Colin Scarato, Johannes Kn\\\"orzer, Leon C. Sander, Markus K. Hoffmann, Michael J. Hartmann, Petr Zapletal","submitted_at":"2026-06-26T15:48:19Z","abstract_excerpt":"With increasing maturity of quantum computers, standard methods for characterizing global properties of their output quantum states via direct measurements and classical post-processing are becoming increasingly impractical due to large measurement costs. Although quantum neural networks could directly process quantum states to identify underlying characteristics with reduced measurement efforts, they often require deep quantum circuits that cannot be implemented on existing devices. To overcome these challenges, we introduce a hybrid quantum-classical neural network that consists of a shallow"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.28199","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/2606.28199/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":"2026-06-29T01:15:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C6dwtZIx79N/xv7fgVZZBLQO8XSFAZL6Zs/JGbjFL6f+DL2yvFQGD0wNhWm23Qw7K2j7iXPlZMhnydFgYpQjDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T18:23:56.021138Z"},"content_sha256":"46856741e9082ca4f543d5f5831bb429d77930321b2976f4f255083417b60509","schema_version":"1.0","event_id":"sha256:46856741e9082ca4f543d5f5831bb429d77930321b2976f4f255083417b60509"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SPD5R6Q7Y76UTNQVOWADVUKDTW/bundle.json","state_url":"https://pith.science/pith/SPD5R6Q7Y76UTNQVOWADVUKDTW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SPD5R6Q7Y76UTNQVOWADVUKDTW/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":"2026-06-29T18:23:56Z","links":{"resolver":"https://pith.science/pith/SPD5R6Q7Y76UTNQVOWADVUKDTW","bundle":"https://pith.science/pith/SPD5R6Q7Y76UTNQVOWADVUKDTW/bundle.json","state":"https://pith.science/pith/SPD5R6Q7Y76UTNQVOWADVUKDTW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SPD5R6Q7Y76UTNQVOWADVUKDTW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:SPD5R6Q7Y76UTNQVOWADVUKDTW","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":"055b0d07084829a24f263baa10f8f30a5e8b4ad98acbabf836f5767fb7d9dc8d","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-06-26T15:48:19Z","title_canon_sha256":"971a07dc10a182b6ddc031b1f0f03462c37090db86b5a66537f71d542e7adf50"},"schema_version":"1.0","source":{"id":"2606.28199","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.28199","created_at":"2026-06-29T01:15:09Z"},{"alias_kind":"arxiv_version","alias_value":"2606.28199v1","created_at":"2026-06-29T01:15:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.28199","created_at":"2026-06-29T01:15:09Z"},{"alias_kind":"pith_short_12","alias_value":"SPD5R6Q7Y76U","created_at":"2026-06-29T01:15:09Z"},{"alias_kind":"pith_short_16","alias_value":"SPD5R6Q7Y76UTNQV","created_at":"2026-06-29T01:15:09Z"},{"alias_kind":"pith_short_8","alias_value":"SPD5R6Q7","created_at":"2026-06-29T01:15:09Z"}],"graph_snapshots":[{"event_id":"sha256:46856741e9082ca4f543d5f5831bb429d77930321b2976f4f255083417b60509","target":"graph","created_at":"2026-06-29T01:15:09Z","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/2606.28199/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"With increasing maturity of quantum computers, standard methods for characterizing global properties of their output quantum states via direct measurements and classical post-processing are becoming increasingly impractical due to large measurement costs. Although quantum neural networks could directly process quantum states to identify underlying characteristics with reduced measurement efforts, they often require deep quantum circuits that cannot be implemented on existing devices. To overcome these challenges, we introduce a hybrid quantum-classical neural network that consists of a shallow","authors_text":"Christoph Hellings, Colin Scarato, Johannes Kn\\\"orzer, Leon C. Sander, Markus K. Hoffmann, Michael J. Hartmann, Petr Zapletal","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-06-26T15:48:19Z","title":"Hybrid quantum-classical neural network for sample-efficient recognition of topological phases"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.28199","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:badb6af0ab93f6d58890d1b2a3e8dae98ff355db9a3efd8349d5604bab881716","target":"record","created_at":"2026-06-29T01:15:09Z","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":"055b0d07084829a24f263baa10f8f30a5e8b4ad98acbabf836f5767fb7d9dc8d","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-06-26T15:48:19Z","title_canon_sha256":"971a07dc10a182b6ddc031b1f0f03462c37090db86b5a66537f71d542e7adf50"},"schema_version":"1.0","source":{"id":"2606.28199","kind":"arxiv","version":1}},"canonical_sha256":"93c7d8fa1fc7fd49b61575803ad1439dbd1e16f7f01e5ab7f1697de45450cac8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"93c7d8fa1fc7fd49b61575803ad1439dbd1e16f7f01e5ab7f1697de45450cac8","first_computed_at":"2026-06-29T01:15:09.054335Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-29T01:15:09.054335Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"D0Di7L7dBYgrCjFhO3R9vXeABe4uUu3hsOkKzIgiFXIM+6KTiTzyM7LHgDH+0xdCeLOauaeliSe/HnIHr2aXCw==","signature_status":"signed_v1","signed_at":"2026-06-29T01:15:09.054753Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.28199","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:badb6af0ab93f6d58890d1b2a3e8dae98ff355db9a3efd8349d5604bab881716","sha256:46856741e9082ca4f543d5f5831bb429d77930321b2976f4f255083417b60509"],"state_sha256":"b0e57002b1ff7f60ff78ff17c8ab120775ead9d1e4f3a77b69359ea6f2eb496e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K60UiCnSkSFi4YOe2qUb1QYo9C20pCeTx8dWTVHA94e64l9zTIWAUmZ7lO2yMsHpKPq4FbxLNYTyD63Jgd/kDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-29T18:23:56.023106Z","bundle_sha256":"f920ed60a1a5ba453136ac5a99dfdd3699faf4e2d3cf5d9c9ee5abd7c31cde10"}}