{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:UC4H3EVIDA5LVIPFDINV7GC4S3","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":"8bcb455aa355dde9d9c9770222eea7b5db623274297653991cbaa5894e7beb37","cross_cats_sorted":["cs.CC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-05-05T18:01:48Z","title_canon_sha256":"9f57cbb13dce1369fdd879fe81b9c1e6492d96d62874ae734628b6a3a154a258"},"schema_version":"1.0","source":{"id":"2005.02421","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2005.02421","created_at":"2026-07-05T01:00:51Z"},{"alias_kind":"arxiv_version","alias_value":"2005.02421v1","created_at":"2026-07-05T01:00:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2005.02421","created_at":"2026-07-05T01:00:51Z"},{"alias_kind":"pith_short_12","alias_value":"UC4H3EVIDA5L","created_at":"2026-07-05T01:00:51Z"},{"alias_kind":"pith_short_16","alias_value":"UC4H3EVIDA5LVIPF","created_at":"2026-07-05T01:00:51Z"},{"alias_kind":"pith_short_8","alias_value":"UC4H3EVI","created_at":"2026-07-05T01:00:51Z"}],"graph_snapshots":[{"event_id":"sha256:aee80df16d2b5e7ecf98e6cfdffa09b8c37d7645ecf2ae18259b2ef4735ff2e1","target":"graph","created_at":"2026-07-05T01:00:51Z","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/2005.02421/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The linear cross-entropy benchmark (Linear XEB) has been used as a test for procedures simulating quantum circuits. Given a quantum circuit $C$ with $n$ inputs and outputs and purported simulator whose output is distributed according to a distribution $p$ over $\\{0,1\\}^n$, the linear XEB fidelity of the simulator is $\\mathcal{F}_{C}(p) = 2^n \\mathbb{E}_{x \\sim p} q_C(x) -1$ where $q_C(x)$ is the probability that $x$ is output from the distribution $C|0^n\\rangle$. A trivial simulator (e.g., the uniform distribution) satisfies $\\mathcal{F}_C(p)=0$, while Google's noisy quantum simulation of a 53","authors_text":"Boaz Barak, Chi-Ning Chou, Xun Gao","cross_cats":["cs.CC"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-05-05T18:01:48Z","title":"Spoofing Linear Cross-Entropy Benchmarking in Shallow Quantum Circuits"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2005.02421","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:ee6050f589173bd657c4d1ea2c4e35e46987c5d59f3b1fecbfb0fe139f62d9a4","target":"record","created_at":"2026-07-05T01:00:51Z","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":"8bcb455aa355dde9d9c9770222eea7b5db623274297653991cbaa5894e7beb37","cross_cats_sorted":["cs.CC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2020-05-05T18:01:48Z","title_canon_sha256":"9f57cbb13dce1369fdd879fe81b9c1e6492d96d62874ae734628b6a3a154a258"},"schema_version":"1.0","source":{"id":"2005.02421","kind":"arxiv","version":1}},"canonical_sha256":"a0b87d92a8183abaa1e51a1b5f985c96d311a90cc5cc45df33ab868373e2d48e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a0b87d92a8183abaa1e51a1b5f985c96d311a90cc5cc45df33ab868373e2d48e","first_computed_at":"2026-07-05T01:00:51.771367Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:00:51.771367Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2BHWbMkruvR4PZOALREjHZ1W2v/T5lNwZD79rPFcqreTBaCEiY9rypRUi00bd8Pr8V5EdU3aIdQZV9Fz6pd2Bw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:00:51.771773Z","signed_message":"canonical_sha256_bytes"},"source_id":"2005.02421","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ee6050f589173bd657c4d1ea2c4e35e46987c5d59f3b1fecbfb0fe139f62d9a4","sha256:aee80df16d2b5e7ecf98e6cfdffa09b8c37d7645ecf2ae18259b2ef4735ff2e1"],"state_sha256":"6540a54e70aa29108d16bde0fa4d928a4e85cc33646ed139099eabafb567d761"}