{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:Q35CYAVXSUJDHY3ETJNTCZJ2FM","short_pith_number":"pith:Q35CYAVX","canonical_record":{"source":{"id":"2606.27254","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-06-25T16:37:29Z","cross_cats_sorted":[],"title_canon_sha256":"fc8b5469d1fda97d203a79dd7877d37083a426599c19d9ca89b4de6dca290283","abstract_canon_sha256":"2e6de0a9a0f9f156be28ba1e9fca8693bd7d0abcecf0018cfaaaf1135c4e3901"},"schema_version":"1.0"},"canonical_sha256":"86fa2c02b7951233e3649a5b31653a2b0b43d36d6bd32d88895dc7bddca22ddf","source":{"kind":"arxiv","id":"2606.27254","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.27254","created_at":"2026-06-26T01:16:16Z"},{"alias_kind":"arxiv_version","alias_value":"2606.27254v1","created_at":"2026-06-26T01:16:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.27254","created_at":"2026-06-26T01:16:16Z"},{"alias_kind":"pith_short_12","alias_value":"Q35CYAVXSUJD","created_at":"2026-06-26T01:16:16Z"},{"alias_kind":"pith_short_16","alias_value":"Q35CYAVXSUJDHY3E","created_at":"2026-06-26T01:16:16Z"},{"alias_kind":"pith_short_8","alias_value":"Q35CYAVX","created_at":"2026-06-26T01:16:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:Q35CYAVXSUJDHY3ETJNTCZJ2FM","target":"record","payload":{"canonical_record":{"source":{"id":"2606.27254","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-06-25T16:37:29Z","cross_cats_sorted":[],"title_canon_sha256":"fc8b5469d1fda97d203a79dd7877d37083a426599c19d9ca89b4de6dca290283","abstract_canon_sha256":"2e6de0a9a0f9f156be28ba1e9fca8693bd7d0abcecf0018cfaaaf1135c4e3901"},"schema_version":"1.0"},"canonical_sha256":"86fa2c02b7951233e3649a5b31653a2b0b43d36d6bd32d88895dc7bddca22ddf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-26T01:16:16.536121Z","signature_b64":"Amm87OtT5snWWZtcbPHA7r8wi55pghT6HQhmIIv16C4rbm1JVXdvyPVdAK673JdZnsKgFdIUv8WIIJw4p4fdAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"86fa2c02b7951233e3649a5b31653a2b0b43d36d6bd32d88895dc7bddca22ddf","last_reissued_at":"2026-06-26T01:16:16.535722Z","signature_status":"signed_v1","first_computed_at":"2026-06-26T01:16:16.535722Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.27254","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":"2026-06-26T01:16:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Q1tqxjrzDpsedJcq/a9VDDXZP4wQdolqtIm3THu8+T0ow424/5YSjdK2byVP7/mBbCXhngaOcatDXoBGXrVVDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T09:14:09.239870Z"},"content_sha256":"7c561e3fe665cf85ed7f28e18ecd755fe94a496abbe3f9f2c13ace7dce0d498d","schema_version":"1.0","event_id":"sha256:7c561e3fe665cf85ed7f28e18ecd755fe94a496abbe3f9f2c13ace7dce0d498d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:Q35CYAVXSUJDHY3ETJNTCZJ2FM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Particle-preserving fermionic shadows with mode-independent sample complexity","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Martin Larocca, Maxwell West, M. Cerezo","submitted_at":"2026-06-25T16:37:29Z","abstract_excerpt":"We consider the problem of learning expectation values of particle-preserving operators with respect to an unknown $\\eta$-particle $n$-mode fermionic state via classical shadows. Our main application is to estimating overlaps with arbitrary Slater determinant states: While it is known that such overlaps can, in the average case, be learnt to a fixed additive precision with a constant number of samples, the best-known worst case bound is $\\mathcal{O}(\\sqrt n \\log n)$; here we improve this to $\\mathcal{O}(\\eta\\log\\eta)$, achieving a mode-independent sample cost. Our procedure is also computation"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.27254","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/2606.27254/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":"2026-06-26T01:16:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NQ2TLMIDHIJ6ZTEJ9lzzbLctLwNf7POE+JVp+uXCDVvsKDYNt6Nbf5hAXvcCgQii5qHhhmfobWILv9dCKlXEDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T09:14:09.240234Z"},"content_sha256":"4beee47bd6c837f7453018bac736f187a2b00b88b090492d80957db719a5fabf","schema_version":"1.0","event_id":"sha256:4beee47bd6c837f7453018bac736f187a2b00b88b090492d80957db719a5fabf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Q35CYAVXSUJDHY3ETJNTCZJ2FM/bundle.json","state_url":"https://pith.science/pith/Q35CYAVXSUJDHY3ETJNTCZJ2FM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Q35CYAVXSUJDHY3ETJNTCZJ2FM/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":"2026-06-29T09:14:09Z","links":{"resolver":"https://pith.science/pith/Q35CYAVXSUJDHY3ETJNTCZJ2FM","bundle":"https://pith.science/pith/Q35CYAVXSUJDHY3ETJNTCZJ2FM/bundle.json","state":"https://pith.science/pith/Q35CYAVXSUJDHY3ETJNTCZJ2FM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Q35CYAVXSUJDHY3ETJNTCZJ2FM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:Q35CYAVXSUJDHY3ETJNTCZJ2FM","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":"2e6de0a9a0f9f156be28ba1e9fca8693bd7d0abcecf0018cfaaaf1135c4e3901","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-06-25T16:37:29Z","title_canon_sha256":"fc8b5469d1fda97d203a79dd7877d37083a426599c19d9ca89b4de6dca290283"},"schema_version":"1.0","source":{"id":"2606.27254","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.27254","created_at":"2026-06-26T01:16:16Z"},{"alias_kind":"arxiv_version","alias_value":"2606.27254v1","created_at":"2026-06-26T01:16:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.27254","created_at":"2026-06-26T01:16:16Z"},{"alias_kind":"pith_short_12","alias_value":"Q35CYAVXSUJD","created_at":"2026-06-26T01:16:16Z"},{"alias_kind":"pith_short_16","alias_value":"Q35CYAVXSUJDHY3E","created_at":"2026-06-26T01:16:16Z"},{"alias_kind":"pith_short_8","alias_value":"Q35CYAVX","created_at":"2026-06-26T01:16:16Z"}],"graph_snapshots":[{"event_id":"sha256:4beee47bd6c837f7453018bac736f187a2b00b88b090492d80957db719a5fabf","target":"graph","created_at":"2026-06-26T01:16:16Z","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/2606.27254/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We consider the problem of learning expectation values of particle-preserving operators with respect to an unknown $\\eta$-particle $n$-mode fermionic state via classical shadows. Our main application is to estimating overlaps with arbitrary Slater determinant states: While it is known that such overlaps can, in the average case, be learnt to a fixed additive precision with a constant number of samples, the best-known worst case bound is $\\mathcal{O}(\\sqrt n \\log n)$; here we improve this to $\\mathcal{O}(\\eta\\log\\eta)$, achieving a mode-independent sample cost. Our procedure is also computation","authors_text":"Martin Larocca, Maxwell West, M. Cerezo","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-06-25T16:37:29Z","title":"Particle-preserving fermionic shadows with mode-independent sample complexity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.27254","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":"sha256:7c561e3fe665cf85ed7f28e18ecd755fe94a496abbe3f9f2c13ace7dce0d498d","target":"record","created_at":"2026-06-26T01:16:16Z","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":"2e6de0a9a0f9f156be28ba1e9fca8693bd7d0abcecf0018cfaaaf1135c4e3901","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-06-25T16:37:29Z","title_canon_sha256":"fc8b5469d1fda97d203a79dd7877d37083a426599c19d9ca89b4de6dca290283"},"schema_version":"1.0","source":{"id":"2606.27254","kind":"arxiv","version":1}},"canonical_sha256":"86fa2c02b7951233e3649a5b31653a2b0b43d36d6bd32d88895dc7bddca22ddf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"86fa2c02b7951233e3649a5b31653a2b0b43d36d6bd32d88895dc7bddca22ddf","first_computed_at":"2026-06-26T01:16:16.535722Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-26T01:16:16.535722Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Amm87OtT5snWWZtcbPHA7r8wi55pghT6HQhmIIv16C4rbm1JVXdvyPVdAK673JdZnsKgFdIUv8WIIJw4p4fdAg==","signature_status":"signed_v1","signed_at":"2026-06-26T01:16:16.536121Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.27254","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7c561e3fe665cf85ed7f28e18ecd755fe94a496abbe3f9f2c13ace7dce0d498d","sha256:4beee47bd6c837f7453018bac736f187a2b00b88b090492d80957db719a5fabf"],"state_sha256":"6bb8760b6a9bcf010c35725084f6356d26949cbd705101fbb154508d7a2dea89"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2E1j7PM9nztT0PEzU5+KoTuMf4+Xc8Vo0E/FTpJhXJoVgVgW8qb3cTlmezyu9rNXrtehOAnKkvIoYFftdQRfDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-29T09:14:09.242470Z","bundle_sha256":"6739f4213c7b474671013007088f49a854a16ebdf4099200fe56fcb6031893dd"}}