{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:UQOOACNDRIGPDXAQZRXHARV5KR","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":"f051716adc105be2d208806492726ad04e23104adaefbb74427fb2f95a8cb8ff","cross_cats_sorted":["cond-mat.dis-nn","cs.ET","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-03-12T17:53:33Z","title_canon_sha256":"5c9eb5b9f238242e518ac3f717e89b4048bc3b366a09ec586b108771b9989720"},"schema_version":"1.0","source":{"id":"2603.12235","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2603.12235","created_at":"2026-07-01T01:17:48Z"},{"alias_kind":"arxiv_version","alias_value":"2603.12235v2","created_at":"2026-07-01T01:17:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2603.12235","created_at":"2026-07-01T01:17:48Z"},{"alias_kind":"pith_short_12","alias_value":"UQOOACNDRIGP","created_at":"2026-07-01T01:17:48Z"},{"alias_kind":"pith_short_16","alias_value":"UQOOACNDRIGPDXAQ","created_at":"2026-07-01T01:17:48Z"},{"alias_kind":"pith_short_8","alias_value":"UQOOACND","created_at":"2026-07-01T01:17:48Z"}],"graph_snapshots":[{"event_id":"sha256:30833efcc5968a983b346af59d8834cd157a1f19160d38dee7f3eeebeffcec4d","target":"graph","created_at":"2026-07-01T01:17:48Z","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/2603.12235/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The theoretical efficiency of classical shadow tomography is predicated on a perfect Haar-random unitary ensemble, yet this mathematical ideal remains physically unattainable in near-term hardware. Here, we report the experimental discovery of a fundamental accuracy bound on integrated photonic processors: a ``Hardware Horizon'' where the reconstruction error undergoes a sharp phase transition. While the error initially obeys the predicted statistical scaling $\\mathcal{O}(M^{-1/2})$, it abruptly saturates at a floor determined by the spectral distortions of the realized unitary group. By deriv","authors_text":"Attila Baumann, G\\'abor Vattay, J\\'anos Koltai, Zsolt Kis","cross_cats":["cond-mat.dis-nn","cs.ET","physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-03-12T17:53:33Z","title":"Transition from Statistical to Hardware-Limited Scaling in Photonic Quantum State Reconstruction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2603.12235","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:d2c603d45ab61137e1b849747c9952e9868d7d93b64edc330c55992ab3835909","target":"record","created_at":"2026-07-01T01:17:48Z","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":"f051716adc105be2d208806492726ad04e23104adaefbb74427fb2f95a8cb8ff","cross_cats_sorted":["cond-mat.dis-nn","cs.ET","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2026-03-12T17:53:33Z","title_canon_sha256":"5c9eb5b9f238242e518ac3f717e89b4048bc3b366a09ec586b108771b9989720"},"schema_version":"1.0","source":{"id":"2603.12235","kind":"arxiv","version":2}},"canonical_sha256":"a41ce009a38a0cf1dc10cc6e7046bd546432a757c3827440ddb803e98d545c71","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a41ce009a38a0cf1dc10cc6e7046bd546432a757c3827440ddb803e98d545c71","first_computed_at":"2026-07-01T01:17:48.768228Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-01T01:17:48.768228Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"r2m3ILDzTEPRkYcfruHm+urThQ8nmHmjZl5St8ScYz1aVfb2R2KO1my23VVK/UCEsd4eRo/75NcFBo1r5PoBCw==","signature_status":"signed_v1","signed_at":"2026-07-01T01:17:48.768857Z","signed_message":"canonical_sha256_bytes"},"source_id":"2603.12235","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d2c603d45ab61137e1b849747c9952e9868d7d93b64edc330c55992ab3835909","sha256:30833efcc5968a983b346af59d8834cd157a1f19160d38dee7f3eeebeffcec4d"],"state_sha256":"2a0d1bf9cac27f7b0625355d2bc7474d032b9bce5b8d6f420c8e3dbcd2b79f05"}