{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:OQ6VXNIBCCDLNCP2SNEW46KHM3","short_pith_number":"pith:OQ6VXNIB","canonical_record":{"source":{"id":"1002.2019","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-02-10T02:20:39Z","cross_cats_sorted":[],"title_canon_sha256":"6f787a71317e8ec1426d0195c42d69a9aeafd3c8ffbdbbb643d65b3dedf41083","abstract_canon_sha256":"0b2d4d454fede5208ee0f07fd605d7b66e285c1a686ee9dd13f7c45323b8fcc8"},"schema_version":"1.0"},"canonical_sha256":"743d5bb5011086b689fa93496e794766ecbd746f23b7ae0546ec0fb2ffd434c7","source":{"kind":"arxiv","id":"1002.2019","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.2019","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"arxiv_version","alias_value":"1002.2019v1","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.2019","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"pith_short_12","alias_value":"OQ6VXNIBCCDL","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"OQ6VXNIBCCDLNCP2","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"OQ6VXNIB","created_at":"2026-05-18T12:26:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:OQ6VXNIBCCDLNCP2SNEW46KHM3","target":"record","payload":{"canonical_record":{"source":{"id":"1002.2019","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-02-10T02:20:39Z","cross_cats_sorted":[],"title_canon_sha256":"6f787a71317e8ec1426d0195c42d69a9aeafd3c8ffbdbbb643d65b3dedf41083","abstract_canon_sha256":"0b2d4d454fede5208ee0f07fd605d7b66e285c1a686ee9dd13f7c45323b8fcc8"},"schema_version":"1.0"},"canonical_sha256":"743d5bb5011086b689fa93496e794766ecbd746f23b7ae0546ec0fb2ffd434c7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:09:10.399032Z","signature_b64":"kqJaKR7kR+d+eoefyIKD8kErTotvJl6AFfkYRMHQd5mTDOduyw5wcVNpX5psxeSZcmRKtfy4h6fxgWMKsKV3BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"743d5bb5011086b689fa93496e794766ecbd746f23b7ae0546ec0fb2ffd434c7","last_reissued_at":"2026-05-18T02:09:10.398328Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:09:10.398328Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1002.2019","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":"2026-05-18T02:09:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xwxuiaoXV9+UhESK9YVzByDs41rskeCXx/56tpdqqpgeL9a6yjgpdowHlfP6EEjXeG88Q5TtUW88juEFp8tWCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T20:48:36.622457Z"},"content_sha256":"14b9f965ba40bdb9d4002863cfad1c195d4b20e7f3a0609b55c7b95f34ac05b4","schema_version":"1.0","event_id":"sha256:14b9f965ba40bdb9d4002863cfad1c195d4b20e7f3a0609b55c7b95f34ac05b4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:OQ6VXNIBCCDLNCP2SNEW46KHM3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quadripartite continuous-variable entanglement via quadruply concurrent downconversion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"A. S. Bradley, M. K. Olsen, O. Pfister, S. L. W. Midgley","submitted_at":"2010-02-10T02:20:39Z","abstract_excerpt":"We investigate an intra-cavity coupled down-conversion scheme to generate quadripartite entanglement using concurrently resonant nonlinearities. We verify that quadripartite entanglement is present in this system by calculating the output fluctuation spectra and then considering violations of optimized inequalities of the van Loock-Furusawa type. The entanglement characteristics both above and below the oscillation threshold are considered. We also present analytic solutions for the quadrature operators and the van Loock-Furusawa correlations in the undepleted pump approximation."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.2019","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":""},"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":"2026-05-18T02:09:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"65Ebfbw7HcDRwlFGLG3eyKTNrCIKJILP9YWSllpTYO9LIeJ4GVGUIppwZJGksvUFbaJy7X03qcZizMYuWsyhDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T20:48:36.623071Z"},"content_sha256":"3b459273c081d4168a06dc4e684a4513c77064e243e08750030991f5badfb781","schema_version":"1.0","event_id":"sha256:3b459273c081d4168a06dc4e684a4513c77064e243e08750030991f5badfb781"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OQ6VXNIBCCDLNCP2SNEW46KHM3/bundle.json","state_url":"https://pith.science/pith/OQ6VXNIBCCDLNCP2SNEW46KHM3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OQ6VXNIBCCDLNCP2SNEW46KHM3/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":"2026-05-24T20:48:36Z","links":{"resolver":"https://pith.science/pith/OQ6VXNIBCCDLNCP2SNEW46KHM3","bundle":"https://pith.science/pith/OQ6VXNIBCCDLNCP2SNEW46KHM3/bundle.json","state":"https://pith.science/pith/OQ6VXNIBCCDLNCP2SNEW46KHM3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OQ6VXNIBCCDLNCP2SNEW46KHM3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:OQ6VXNIBCCDLNCP2SNEW46KHM3","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":"0b2d4d454fede5208ee0f07fd605d7b66e285c1a686ee9dd13f7c45323b8fcc8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-02-10T02:20:39Z","title_canon_sha256":"6f787a71317e8ec1426d0195c42d69a9aeafd3c8ffbdbbb643d65b3dedf41083"},"schema_version":"1.0","source":{"id":"1002.2019","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.2019","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"arxiv_version","alias_value":"1002.2019v1","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.2019","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"pith_short_12","alias_value":"OQ6VXNIBCCDL","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"OQ6VXNIBCCDLNCP2","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"OQ6VXNIB","created_at":"2026-05-18T12:26:12Z"}],"graph_snapshots":[{"event_id":"sha256:3b459273c081d4168a06dc4e684a4513c77064e243e08750030991f5badfb781","target":"graph","created_at":"2026-05-18T02:09:10Z","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 investigate an intra-cavity coupled down-conversion scheme to generate quadripartite entanglement using concurrently resonant nonlinearities. We verify that quadripartite entanglement is present in this system by calculating the output fluctuation spectra and then considering violations of optimized inequalities of the van Loock-Furusawa type. The entanglement characteristics both above and below the oscillation threshold are considered. We also present analytic solutions for the quadrature operators and the van Loock-Furusawa correlations in the undepleted pump approximation.","authors_text":"A. S. Bradley, M. K. Olsen, O. Pfister, S. L. W. Midgley","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-02-10T02:20:39Z","title":"Quadripartite continuous-variable entanglement via quadruply concurrent downconversion"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.2019","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":"sha256:14b9f965ba40bdb9d4002863cfad1c195d4b20e7f3a0609b55c7b95f34ac05b4","target":"record","created_at":"2026-05-18T02:09:10Z","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":"0b2d4d454fede5208ee0f07fd605d7b66e285c1a686ee9dd13f7c45323b8fcc8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-02-10T02:20:39Z","title_canon_sha256":"6f787a71317e8ec1426d0195c42d69a9aeafd3c8ffbdbbb643d65b3dedf41083"},"schema_version":"1.0","source":{"id":"1002.2019","kind":"arxiv","version":1}},"canonical_sha256":"743d5bb5011086b689fa93496e794766ecbd746f23b7ae0546ec0fb2ffd434c7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"743d5bb5011086b689fa93496e794766ecbd746f23b7ae0546ec0fb2ffd434c7","first_computed_at":"2026-05-18T02:09:10.398328Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:09:10.398328Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kqJaKR7kR+d+eoefyIKD8kErTotvJl6AFfkYRMHQd5mTDOduyw5wcVNpX5psxeSZcmRKtfy4h6fxgWMKsKV3BA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:09:10.399032Z","signed_message":"canonical_sha256_bytes"},"source_id":"1002.2019","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:14b9f965ba40bdb9d4002863cfad1c195d4b20e7f3a0609b55c7b95f34ac05b4","sha256:3b459273c081d4168a06dc4e684a4513c77064e243e08750030991f5badfb781"],"state_sha256":"240e6c1e38814724b0e461a9920ff9fd027635864342349bf0c82a909535b83a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QPRPyqKiSWkE4XTUbGJG5Glio+asHNVxLRocnM2+wk+xjHkagvvw529T+yFmH6IyMT1UCdGY8g9/uGy8Bfe7Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-24T20:48:36.626211Z","bundle_sha256":"6f5048f746b437557c9c3396f83e5afe686fdc27b7fefb5dc5c6c9aa1df767c8"}}