{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:Q53632VYNVPT2BEJXJ2QRN7FPN","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":"9bd3bcbf58125e5a76a643d45387423bc8db7850ec25706bc95f8c1ddba189af","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-08-25T08:01:12Z","title_canon_sha256":"a9346c21f64bc40057d42e3c61d9fadabc58a5d251ef3679c45e159f81b2bf87"},"schema_version":"1.0","source":{"id":"0908.3548","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.3548","created_at":"2026-05-18T02:12:23Z"},{"alias_kind":"arxiv_version","alias_value":"0908.3548v1","created_at":"2026-05-18T02:12:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.3548","created_at":"2026-05-18T02:12:23Z"},{"alias_kind":"pith_short_12","alias_value":"Q53632VYNVPT","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"Q53632VYNVPT2BEJ","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"Q53632VY","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:9f7099e3896e3569e9b11f52d8f654735709582da510d23da688c228f44d0203","target":"graph","created_at":"2026-05-18T02:12:23Z","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"},"paper":{"abstract_excerpt":"We analyze the strength of polarization correlations between two light beams that can be achieved in the semiclassical regime using statistical mixtures of coherent states and binary on/off detectors. Under certain symmetry assumptions, the visibility of polarization correlations is shown to be bounded by 1/3, which is in a striking contrast with perfect 100% correlations exhibited by photon pairs prepared in the singlet state. The semiclassical limit is demonstrated in a measurement performed on a pair of laser beams undergoing correlated depolarization. This result illustrates the dramatic d","authors_text":"Czeslaw Radzewicz, Konrad Banaszek, Michal Karpinski, Piotr Migdal, Rafal Demkowicz-Dobrzanski","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-08-25T08:01:12Z","title":"Quantum and semiclassical polarization correlations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.3548","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:c4d14dafc7fcb3eaade62e6edf10bc1b832eb08cd69e8f1a53a6ff654294dca3","target":"record","created_at":"2026-05-18T02:12:23Z","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":"9bd3bcbf58125e5a76a643d45387423bc8db7850ec25706bc95f8c1ddba189af","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-08-25T08:01:12Z","title_canon_sha256":"a9346c21f64bc40057d42e3c61d9fadabc58a5d251ef3679c45e159f81b2bf87"},"schema_version":"1.0","source":{"id":"0908.3548","kind":"arxiv","version":1}},"canonical_sha256":"8777edeab86d5f3d0489ba7508b7e57b6f2869f7cee4d2089af46a874b48718d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8777edeab86d5f3d0489ba7508b7e57b6f2869f7cee4d2089af46a874b48718d","first_computed_at":"2026-05-18T02:12:23.338095Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:23.338095Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4BvT4N67BuPjlrG6Vc7gKi5qhTbTEO5CkWiNwLCsv7JeP6csnKdakQlu1RbKJ7aBS3KV8/bxkkqVBvoaE2GkAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:23.338817Z","signed_message":"canonical_sha256_bytes"},"source_id":"0908.3548","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c4d14dafc7fcb3eaade62e6edf10bc1b832eb08cd69e8f1a53a6ff654294dca3","sha256:9f7099e3896e3569e9b11f52d8f654735709582da510d23da688c228f44d0203"],"state_sha256":"79ab7a6b492b09025aefe5a2a9db3e29d9f4e30643e03df91a9bf8227b66f8b3"}