{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:IJGLTQXYSNJ3VBADTWYZF2OPAB","short_pith_number":"pith:IJGLTQXY","canonical_record":{"source":{"id":"2607.27883","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-07-30T08:56:08Z","cross_cats_sorted":[],"title_canon_sha256":"1d396bdcb5ccfa456244dae11fed0ed36a01d4109c31ea44fb2c4edadbe378ce","abstract_canon_sha256":"9cfd7acff1b92474a7264755d8d673ea5531209fcdc5fe5f87e7944feb6ef986"},"schema_version":"1.0"},"canonical_sha256":"424cb9c2f89353ba84039db192e9cf0055ff194311f542b495c14959e133c4bd","source":{"kind":"arxiv","id":"2607.27883","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.27883","created_at":"2026-07-31T01:34:33Z"},{"alias_kind":"arxiv_version","alias_value":"2607.27883v1","created_at":"2026-07-31T01:34:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.27883","created_at":"2026-07-31T01:34:33Z"},{"alias_kind":"pith_short_12","alias_value":"IJGLTQXYSNJ3","created_at":"2026-07-31T01:34:33Z"},{"alias_kind":"pith_short_16","alias_value":"IJGLTQXYSNJ3VBAD","created_at":"2026-07-31T01:34:33Z"},{"alias_kind":"pith_short_8","alias_value":"IJGLTQXY","created_at":"2026-07-31T01:34:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:IJGLTQXYSNJ3VBADTWYZF2OPAB","target":"record","payload":{"canonical_record":{"source":{"id":"2607.27883","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-07-30T08:56:08Z","cross_cats_sorted":[],"title_canon_sha256":"1d396bdcb5ccfa456244dae11fed0ed36a01d4109c31ea44fb2c4edadbe378ce","abstract_canon_sha256":"9cfd7acff1b92474a7264755d8d673ea5531209fcdc5fe5f87e7944feb6ef986"},"schema_version":"1.0"},"canonical_sha256":"424cb9c2f89353ba84039db192e9cf0055ff194311f542b495c14959e133c4bd","receipt":{"kind":"pith_receipt","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"424cb9c2f89353ba84039db192e9cf0055ff194311f542b495c14959e133c4bd","last_reissued_at":"2026-07-31T01:34:33.307306Z","signature_status":"unsigned_v0","first_computed_at":"2026-07-31T01:34:33.307306Z"},"source_kind":"arxiv","source_id":"2607.27883","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":"2026-07-31T01:34:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Xg/mjCST0wHn7MvDvz81Lw33MT8FCBwX/WIG0lMINM0iYje+mUNiw/vwIxkGIoY2u/rmq2IQLZV7CS5+jyq+DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T14:05:06.975830Z"},"content_sha256":"ee4567c8794ed89f93aa26c31f7bd51013343ce1b023efd8be83c8b661c55892","schema_version":"1.0","event_id":"sha256:ee4567c8794ed89f93aa26c31f7bd51013343ce1b023efd8be83c8b661c55892"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:IJGLTQXYSNJ3VBADTWYZF2OPAB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Trainability and Mode Separation of Mixed IQP-QCBMs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Hyunwoo Kim, Youngseok Lee","submitted_at":"2026-07-30T08:56:08Z","abstract_excerpt":"Quantum circuit Born machines (QCBMs) based on instantaneous quantum polynomial-time (IQP) circuits are promising quantum generative models for their classical trainability. It is known that their ancilla-free form avoids barren plateaus under certain initializations, but remains non-universal. Although adding ancilla qubits raises the expressivity, whether the ancilla-extended model retains local trainability remains unknown. We propose the mixed IQP-QCBM, which generalizes the ancilla-extended circuit as a weighted mixture of ancilla-free IQP circuits, called branches. For a polynomial numbe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.27883","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/2607.27883/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":"2026-07-31T01:34:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jPwwD02UyteeBYZKM3wqRmvxQyKgwajKHTF59LSIPR+/o6vTdlJ3DP7mvq77+tE8llaGI81ZCNb+ukuwbbMDDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T14:05:06.976466Z"},"content_sha256":"38fabadb4988e39836011b378571ae6a849eaebb75f878c14874ad5ec31bedb8","schema_version":"1.0","event_id":"sha256:38fabadb4988e39836011b378571ae6a849eaebb75f878c14874ad5ec31bedb8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IJGLTQXYSNJ3VBADTWYZF2OPAB/bundle.json","state_url":"https://pith.science/pith/IJGLTQXYSNJ3VBADTWYZF2OPAB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IJGLTQXYSNJ3VBADTWYZF2OPAB/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":"2026-08-03T14:05:06Z","links":{"resolver":"https://pith.science/pith/IJGLTQXYSNJ3VBADTWYZF2OPAB","bundle":"https://pith.science/pith/IJGLTQXYSNJ3VBADTWYZF2OPAB/bundle.json","state":"https://pith.science/pith/IJGLTQXYSNJ3VBADTWYZF2OPAB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IJGLTQXYSNJ3VBADTWYZF2OPAB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:IJGLTQXYSNJ3VBADTWYZF2OPAB","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":"9cfd7acff1b92474a7264755d8d673ea5531209fcdc5fe5f87e7944feb6ef986","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-07-30T08:56:08Z","title_canon_sha256":"1d396bdcb5ccfa456244dae11fed0ed36a01d4109c31ea44fb2c4edadbe378ce"},"schema_version":"1.0","source":{"id":"2607.27883","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.27883","created_at":"2026-07-31T01:34:33Z"},{"alias_kind":"arxiv_version","alias_value":"2607.27883v1","created_at":"2026-07-31T01:34:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.27883","created_at":"2026-07-31T01:34:33Z"},{"alias_kind":"pith_short_12","alias_value":"IJGLTQXYSNJ3","created_at":"2026-07-31T01:34:33Z"},{"alias_kind":"pith_short_16","alias_value":"IJGLTQXYSNJ3VBAD","created_at":"2026-07-31T01:34:33Z"},{"alias_kind":"pith_short_8","alias_value":"IJGLTQXY","created_at":"2026-07-31T01:34:33Z"}],"graph_snapshots":[{"event_id":"sha256:38fabadb4988e39836011b378571ae6a849eaebb75f878c14874ad5ec31bedb8","target":"graph","created_at":"2026-07-31T01:34:33Z","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/2607.27883/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum circuit Born machines (QCBMs) based on instantaneous quantum polynomial-time (IQP) circuits are promising quantum generative models for their classical trainability. It is known that their ancilla-free form avoids barren plateaus under certain initializations, but remains non-universal. Although adding ancilla qubits raises the expressivity, whether the ancilla-extended model retains local trainability remains unknown. We propose the mixed IQP-QCBM, which generalizes the ancilla-extended circuit as a weighted mixture of ancilla-free IQP circuits, called branches. For a polynomial numbe","authors_text":"Hyunwoo Kim, Youngseok Lee","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-07-30T08:56:08Z","title":"Trainability and Mode Separation of Mixed IQP-QCBMs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.27883","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:ee4567c8794ed89f93aa26c31f7bd51013343ce1b023efd8be83c8b661c55892","target":"record","created_at":"2026-07-31T01:34:33Z","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":"9cfd7acff1b92474a7264755d8d673ea5531209fcdc5fe5f87e7944feb6ef986","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-07-30T08:56:08Z","title_canon_sha256":"1d396bdcb5ccfa456244dae11fed0ed36a01d4109c31ea44fb2c4edadbe378ce"},"schema_version":"1.0","source":{"id":"2607.27883","kind":"arxiv","version":1}},"canonical_sha256":"424cb9c2f89353ba84039db192e9cf0055ff194311f542b495c14959e133c4bd","receipt":{"builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"424cb9c2f89353ba84039db192e9cf0055ff194311f542b495c14959e133c4bd","first_computed_at":"2026-07-31T01:34:33.307306Z","kind":"pith_receipt","last_reissued_at":"2026-07-31T01:34:33.307306Z","receipt_version":"0.3","signature_status":"unsigned_v0"},"source_id":"2607.27883","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ee4567c8794ed89f93aa26c31f7bd51013343ce1b023efd8be83c8b661c55892","sha256:38fabadb4988e39836011b378571ae6a849eaebb75f878c14874ad5ec31bedb8"],"state_sha256":"9665875326a1a9fa2213ad88941f67d6f2bb4ff4c24708ca39c5607212b2fbc9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"157G+LH4p0Kv5oXp7YoI0JznudregPMo7+Ns8KU/3zlKrvt3OfISS/tYkUUr2oVXO/drkXTb5sguiey9S7ziAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T14:05:06.981479Z","bundle_sha256":"8af94d61ab8272010d3bb13d7b9b4fae9f30b58d4244f6d10ee0114c943767c4"}}