{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2005:YIOSOP6EHYCVBBA6KFXQNFMYSZ","short_pith_number":"pith:YIOSOP6E","canonical_record":{"source":{"id":"quant-ph/0507086","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2005-07-08T15:23:48Z","cross_cats_sorted":[],"title_canon_sha256":"05e35dfb625b183220265913da6bdbd54ff3985c9ea2fc9c32fe448920030882","abstract_canon_sha256":"bf8533ad9af45f7d7e38a6f6737c4261a5834328bb2120be1c2881e969bf6bee"},"schema_version":"1.0"},"canonical_sha256":"c21d273fc43e0550841e516f069598967fd67abc578166a3e1164ab6500bdb54","source":{"kind":"arxiv","id":"quant-ph/0507086","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0507086","created_at":"2026-07-04T16:57:37Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0507086v1","created_at":"2026-07-04T16:57:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0507086","created_at":"2026-07-04T16:57:37Z"},{"alias_kind":"pith_short_12","alias_value":"YIOSOP6EHYCV","created_at":"2026-07-04T16:57:37Z"},{"alias_kind":"pith_short_16","alias_value":"YIOSOP6EHYCVBBA6","created_at":"2026-07-04T16:57:37Z"},{"alias_kind":"pith_short_8","alias_value":"YIOSOP6E","created_at":"2026-07-04T16:57:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2005:YIOSOP6EHYCVBBA6KFXQNFMYSZ","target":"record","payload":{"canonical_record":{"source":{"id":"quant-ph/0507086","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2005-07-08T15:23:48Z","cross_cats_sorted":[],"title_canon_sha256":"05e35dfb625b183220265913da6bdbd54ff3985c9ea2fc9c32fe448920030882","abstract_canon_sha256":"bf8533ad9af45f7d7e38a6f6737c4261a5834328bb2120be1c2881e969bf6bee"},"schema_version":"1.0"},"canonical_sha256":"c21d273fc43e0550841e516f069598967fd67abc578166a3e1164ab6500bdb54","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:57:37.665746Z","signature_b64":"U9OJoWIs3nCzqWzP9DrjfnUaeMcbR5qZzzeK6CgzaJg0Y6H6u07QdKiVKnOb2rTu3wT6tgZHJVZAcJUPa2FlBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c21d273fc43e0550841e516f069598967fd67abc578166a3e1164ab6500bdb54","last_reissued_at":"2026-07-04T16:57:37.665358Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:57:37.665358Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"quant-ph/0507086","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":"2026-07-04T16:57:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1Um2CDXldmYmxaS6/JRZYrM27lb5yeDKE5iURQkDe7SKU8r3DpbxIAfpwRy0kTHcHjNhcA9vFChBVFcXm6p6Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T07:30:41.162251Z"},"content_sha256":"99464fdbe59994ac05aaf2536cd4255312c2d6647ae9375c3b413d865097598a","schema_version":"1.0","event_id":"sha256:99464fdbe59994ac05aaf2536cd4255312c2d6647ae9375c3b413d865097598a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2005:YIOSOP6EHYCVBBA6KFXQNFMYSZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Experimental violation of a cluster state Bell inequality","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Anton Zeilinger, Kevin J. Resch, Markus Aspelmeyer, Philip Walther","submitted_at":"2005-07-08T15:23:48Z","abstract_excerpt":"Cluster states are a new type of multiqubit entangled states with entanglement properties exceptionally well suited for quantum computation. In the present work, we experimentally demonstrate that correlations in a four-qubit linear cluster state cannot be described by local realism. This exploration is based on a recently derived Bell-type inequality [V. Scarani et al., Phys. Rev A 71, 042325 (2005)] which is tailored, by using a combination of three- and four-particle correlations, to be maximally violated by cluster states but not violated at all by GHZ states. We observe a cluster state Be"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0507086","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/quant-ph/0507086/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":"2026-07-04T16:57:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X8vNrTPVXuxBHbJbTJT4MnMZee7nnGBquXjSzYVB8A4H+KeJfTLnrlPx0SWUTsW6t0pj9wKWXiTlwnD8kMn8AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T07:30:41.162761Z"},"content_sha256":"61293b9f009c2d0d536baf51663920b6c4885c89943019ae75f5af590250841d","schema_version":"1.0","event_id":"sha256:61293b9f009c2d0d536baf51663920b6c4885c89943019ae75f5af590250841d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YIOSOP6EHYCVBBA6KFXQNFMYSZ/bundle.json","state_url":"https://pith.science/pith/YIOSOP6EHYCVBBA6KFXQNFMYSZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YIOSOP6EHYCVBBA6KFXQNFMYSZ/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":"2026-08-07T07:30:41Z","links":{"resolver":"https://pith.science/pith/YIOSOP6EHYCVBBA6KFXQNFMYSZ","bundle":"https://pith.science/pith/YIOSOP6EHYCVBBA6KFXQNFMYSZ/bundle.json","state":"https://pith.science/pith/YIOSOP6EHYCVBBA6KFXQNFMYSZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YIOSOP6EHYCVBBA6KFXQNFMYSZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2005:YIOSOP6EHYCVBBA6KFXQNFMYSZ","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":"bf8533ad9af45f7d7e38a6f6737c4261a5834328bb2120be1c2881e969bf6bee","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2005-07-08T15:23:48Z","title_canon_sha256":"05e35dfb625b183220265913da6bdbd54ff3985c9ea2fc9c32fe448920030882"},"schema_version":"1.0","source":{"id":"quant-ph/0507086","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0507086","created_at":"2026-07-04T16:57:37Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0507086v1","created_at":"2026-07-04T16:57:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0507086","created_at":"2026-07-04T16:57:37Z"},{"alias_kind":"pith_short_12","alias_value":"YIOSOP6EHYCV","created_at":"2026-07-04T16:57:37Z"},{"alias_kind":"pith_short_16","alias_value":"YIOSOP6EHYCVBBA6","created_at":"2026-07-04T16:57:37Z"},{"alias_kind":"pith_short_8","alias_value":"YIOSOP6E","created_at":"2026-07-04T16:57:37Z"}],"graph_snapshots":[{"event_id":"sha256:61293b9f009c2d0d536baf51663920b6c4885c89943019ae75f5af590250841d","target":"graph","created_at":"2026-07-04T16:57:37Z","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/quant-ph/0507086/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Cluster states are a new type of multiqubit entangled states with entanglement properties exceptionally well suited for quantum computation. In the present work, we experimentally demonstrate that correlations in a four-qubit linear cluster state cannot be described by local realism. This exploration is based on a recently derived Bell-type inequality [V. Scarani et al., Phys. Rev A 71, 042325 (2005)] which is tailored, by using a combination of three- and four-particle correlations, to be maximally violated by cluster states but not violated at all by GHZ states. We observe a cluster state Be","authors_text":"Anton Zeilinger, Kevin J. Resch, Markus Aspelmeyer, Philip Walther","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"2005-07-08T15:23:48Z","title":"Experimental violation of a cluster state Bell inequality"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0507086","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":"sha256:99464fdbe59994ac05aaf2536cd4255312c2d6647ae9375c3b413d865097598a","target":"record","created_at":"2026-07-04T16:57:37Z","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":"bf8533ad9af45f7d7e38a6f6737c4261a5834328bb2120be1c2881e969bf6bee","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2005-07-08T15:23:48Z","title_canon_sha256":"05e35dfb625b183220265913da6bdbd54ff3985c9ea2fc9c32fe448920030882"},"schema_version":"1.0","source":{"id":"quant-ph/0507086","kind":"arxiv","version":1}},"canonical_sha256":"c21d273fc43e0550841e516f069598967fd67abc578166a3e1164ab6500bdb54","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c21d273fc43e0550841e516f069598967fd67abc578166a3e1164ab6500bdb54","first_computed_at":"2026-07-04T16:57:37.665358Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:57:37.665358Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"U9OJoWIs3nCzqWzP9DrjfnUaeMcbR5qZzzeK6CgzaJg0Y6H6u07QdKiVKnOb2rTu3wT6tgZHJVZAcJUPa2FlBA==","signature_status":"signed_v1","signed_at":"2026-07-04T16:57:37.665746Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/0507086","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:99464fdbe59994ac05aaf2536cd4255312c2d6647ae9375c3b413d865097598a","sha256:61293b9f009c2d0d536baf51663920b6c4885c89943019ae75f5af590250841d"],"state_sha256":"0872ac914aaa93160267cea561ab6785819c0f879ec914eb57e26e4be460f6d4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"txvpFsWYBvXLMBSxVdi83MwyrKc2QbwUZ8Kgf9pBds38hpbz+YqoMk6Mt0xr+7IYAO7zlpViaNYyBpDwaMT2CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T07:30:41.167585Z","bundle_sha256":"f4276d807d6e02c4c49f7546c11488d31c67883239953edc659d41120f3f6a1c"}}