{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2024:R6SQM2OD25CXPHYGJNJS5H6K45","short_pith_number":"pith:R6SQM2OD","schema_version":"1.0","canonical_sha256":"8fa50669c3d745779f064b532e9fcae7647a2b8500b069b79292cb62dfdb13b3","source":{"kind":"arxiv","id":"2405.01025","version":2},"attestation_state":"computed","paper":{"title":"Density Matrix Realism","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cond-mat.stat-mech","physics.hist-ph"],"primary_cat":"quant-ph","authors_text":"Eddy Keming Chen","submitted_at":"2024-05-02T05:56:34Z","abstract_excerpt":"Realism about quantum theory naturally leads to realism about the quantum state of the universe. It leaves open whether it is a pure state represented by a wave function, or an impure (mixed) one represented by a density matrix. I characterize and elaborate on Density Matrix Realism, the thesis that the universal quantum state is objective but can be impure. To clarify the thesis, I compare it with Wave Function Realism, explain the conditions under which they are empirically equivalent, consider two generalizations of Density Matrix Realism, and answer some frequently asked questions. I end b"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2405.01025","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2024-05-02T05:56:34Z","cross_cats_sorted":["cond-mat.stat-mech","physics.hist-ph"],"title_canon_sha256":"aae0e3182fe5511634beeae6428b2943443bbb931c78c05d4f6565fbe4d0cf20","abstract_canon_sha256":"59ce61a75e3dfe1a04f4e3c01376af4eff78efef3ed97c1c57ba529fc8799514"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:30:13.357417Z","signature_b64":"T+ZwGecT9JPF//nripEymoen7Mv2UqZ+eTO1x4H31pVM+GqzFkQXe8EZMnj9+Cka+uWCKLv5kisJ2rDjPINIAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8fa50669c3d745779f064b532e9fcae7647a2b8500b069b79292cb62dfdb13b3","last_reissued_at":"2026-07-05T09:30:13.356918Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:30:13.356918Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Density Matrix Realism","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cond-mat.stat-mech","physics.hist-ph"],"primary_cat":"quant-ph","authors_text":"Eddy Keming Chen","submitted_at":"2024-05-02T05:56:34Z","abstract_excerpt":"Realism about quantum theory naturally leads to realism about the quantum state of the universe. It leaves open whether it is a pure state represented by a wave function, or an impure (mixed) one represented by a density matrix. I characterize and elaborate on Density Matrix Realism, the thesis that the universal quantum state is objective but can be impure. To clarify the thesis, I compare it with Wave Function Realism, explain the conditions under which they are empirically equivalent, consider two generalizations of Density Matrix Realism, and answer some frequently asked questions. I end b"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2405.01025","kind":"arxiv","version":2},"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/2405.01025/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2405.01025","created_at":"2026-07-05T09:30:13.356981+00:00"},{"alias_kind":"arxiv_version","alias_value":"2405.01025v2","created_at":"2026-07-05T09:30:13.356981+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2405.01025","created_at":"2026-07-05T09:30:13.356981+00:00"},{"alias_kind":"pith_short_12","alias_value":"R6SQM2OD25CX","created_at":"2026-07-05T09:30:13.356981+00:00"},{"alias_kind":"pith_short_16","alias_value":"R6SQM2OD25CXPHYG","created_at":"2026-07-05T09:30:13.356981+00:00"},{"alias_kind":"pith_short_8","alias_value":"R6SQM2OD","created_at":"2026-07-05T09:30:13.356981+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2502.14136","citing_title":"Thermodynamic closure of quantum measurements and the limits of the indirect measurement model","ref_index":41,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/R6SQM2OD25CXPHYGJNJS5H6K45","json":"https://pith.science/pith/R6SQM2OD25CXPHYGJNJS5H6K45.json","graph_json":"https://pith.science/api/pith-number/R6SQM2OD25CXPHYGJNJS5H6K45/graph.json","events_json":"https://pith.science/api/pith-number/R6SQM2OD25CXPHYGJNJS5H6K45/events.json","paper":"https://pith.science/paper/R6SQM2OD"},"agent_actions":{"view_html":"https://pith.science/pith/R6SQM2OD25CXPHYGJNJS5H6K45","download_json":"https://pith.science/pith/R6SQM2OD25CXPHYGJNJS5H6K45.json","view_paper":"https://pith.science/paper/R6SQM2OD","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2405.01025&json=true","fetch_graph":"https://pith.science/api/pith-number/R6SQM2OD25CXPHYGJNJS5H6K45/graph.json","fetch_events":"https://pith.science/api/pith-number/R6SQM2OD25CXPHYGJNJS5H6K45/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/R6SQM2OD25CXPHYGJNJS5H6K45/action/timestamp_anchor","attest_storage":"https://pith.science/pith/R6SQM2OD25CXPHYGJNJS5H6K45/action/storage_attestation","attest_author":"https://pith.science/pith/R6SQM2OD25CXPHYGJNJS5H6K45/action/author_attestation","sign_citation":"https://pith.science/pith/R6SQM2OD25CXPHYGJNJS5H6K45/action/citation_signature","submit_replication":"https://pith.science/pith/R6SQM2OD25CXPHYGJNJS5H6K45/action/replication_record"}},"created_at":"2026-07-05T09:30:13.356981+00:00","updated_at":"2026-07-05T09:30:13.356981+00:00"}