{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:AK4U5J2JN3DZAZF3GKNDEVO2RQ","short_pith_number":"pith:AK4U5J2J","canonical_record":{"source":{"id":"0904.1058","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-04-07T06:04:45Z","cross_cats_sorted":[],"title_canon_sha256":"392af2736ee630e9802292f8a13f52cca575ebc6e90e1653ef60144ff4dd262a","abstract_canon_sha256":"9e88eb7a6f278a82ef60a012e1dc25422f7d5f73d037a484e412041947195e01"},"schema_version":"1.0"},"canonical_sha256":"02b94ea7496ec79064bb329a3255da8c0f0e256335b126ce2c7737ca3bcac7f7","source":{"kind":"arxiv","id":"0904.1058","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.1058","created_at":"2026-07-04T17:18:50Z"},{"alias_kind":"arxiv_version","alias_value":"0904.1058v3","created_at":"2026-07-04T17:18:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.1058","created_at":"2026-07-04T17:18:50Z"},{"alias_kind":"pith_short_12","alias_value":"AK4U5J2JN3DZ","created_at":"2026-07-04T17:18:50Z"},{"alias_kind":"pith_short_16","alias_value":"AK4U5J2JN3DZAZF3","created_at":"2026-07-04T17:18:50Z"},{"alias_kind":"pith_short_8","alias_value":"AK4U5J2J","created_at":"2026-07-04T17:18:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:AK4U5J2JN3DZAZF3GKNDEVO2RQ","target":"record","payload":{"canonical_record":{"source":{"id":"0904.1058","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-04-07T06:04:45Z","cross_cats_sorted":[],"title_canon_sha256":"392af2736ee630e9802292f8a13f52cca575ebc6e90e1653ef60144ff4dd262a","abstract_canon_sha256":"9e88eb7a6f278a82ef60a012e1dc25422f7d5f73d037a484e412041947195e01"},"schema_version":"1.0"},"canonical_sha256":"02b94ea7496ec79064bb329a3255da8c0f0e256335b126ce2c7737ca3bcac7f7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:18:50.422388Z","signature_b64":"gDA8gnMLSVyAfiCiCPpfxJz5wwU02f4pjiV6addDnn6W20fcpUpP6e5H+4VkytO1bfMHuGI+79JAwzFNPanQCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"02b94ea7496ec79064bb329a3255da8c0f0e256335b126ce2c7737ca3bcac7f7","last_reissued_at":"2026-07-04T17:18:50.422046Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:18:50.422046Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0904.1058","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T17:18:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QtrWgRIss+OCsiggw/wjfE0LqxdxUfYco2p0LWHOIBALDFxjq5cPHRNqnaHQFVidWSYJOuPsjf23Ae1BblDBCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T20:57:35.748331Z"},"content_sha256":"1fec89561fd1e1edfa0dfbf68cb6d2568ad7232960b12e9b20877249002f3b3d","schema_version":"1.0","event_id":"sha256:1fec89561fd1e1edfa0dfbf68cb6d2568ad7232960b12e9b20877249002f3b3d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:AK4U5J2JN3DZAZF3GKNDEVO2RQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Witnessing entanglement in phase space using inefficient detectors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Dieter Jaksch, Hyunseok Jeong, Seung-Woo Lee","submitted_at":"2009-04-07T06:04:45Z","abstract_excerpt":"We propose a scheme for witnessing entanglement in phase space by significantly inefficient detectors. The implementation of this scheme does not require any additional process for correcting errors in contrast to previous proposals. Moreover, it allows us to detect entanglement without full a priori knowledge of the detection efficiency. It is shown that entanglement in single photon entangled and two-mode squeezed states can be witnessed with detection efficiency as low as 40%. Our approach enhances the possibility of witnessing entanglement in various physical systems using current detectio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.1058","kind":"arxiv","version":3},"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/0904.1058/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":"2026-07-04T17:18:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3NTfZ1KioMn3loEUljeMe/C0Pr5ncxyJYXI+MqOET8qZXuuSq6BrQPolIdeIxK7THFcKLLO3/ZvP9Bc8JZj1Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T20:57:35.749185Z"},"content_sha256":"6fd18521852e880580ec999c17df74485153820a5ff6718eb40981760f03f421","schema_version":"1.0","event_id":"sha256:6fd18521852e880580ec999c17df74485153820a5ff6718eb40981760f03f421"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AK4U5J2JN3DZAZF3GKNDEVO2RQ/bundle.json","state_url":"https://pith.science/pith/AK4U5J2JN3DZAZF3GKNDEVO2RQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AK4U5J2JN3DZAZF3GKNDEVO2RQ/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":"2026-08-18T20:57:35Z","links":{"resolver":"https://pith.science/pith/AK4U5J2JN3DZAZF3GKNDEVO2RQ","bundle":"https://pith.science/pith/AK4U5J2JN3DZAZF3GKNDEVO2RQ/bundle.json","state":"https://pith.science/pith/AK4U5J2JN3DZAZF3GKNDEVO2RQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AK4U5J2JN3DZAZF3GKNDEVO2RQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:AK4U5J2JN3DZAZF3GKNDEVO2RQ","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":"9e88eb7a6f278a82ef60a012e1dc25422f7d5f73d037a484e412041947195e01","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-04-07T06:04:45Z","title_canon_sha256":"392af2736ee630e9802292f8a13f52cca575ebc6e90e1653ef60144ff4dd262a"},"schema_version":"1.0","source":{"id":"0904.1058","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.1058","created_at":"2026-07-04T17:18:50Z"},{"alias_kind":"arxiv_version","alias_value":"0904.1058v3","created_at":"2026-07-04T17:18:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.1058","created_at":"2026-07-04T17:18:50Z"},{"alias_kind":"pith_short_12","alias_value":"AK4U5J2JN3DZ","created_at":"2026-07-04T17:18:50Z"},{"alias_kind":"pith_short_16","alias_value":"AK4U5J2JN3DZAZF3","created_at":"2026-07-04T17:18:50Z"},{"alias_kind":"pith_short_8","alias_value":"AK4U5J2J","created_at":"2026-07-04T17:18:50Z"}],"graph_snapshots":[{"event_id":"sha256:6fd18521852e880580ec999c17df74485153820a5ff6718eb40981760f03f421","target":"graph","created_at":"2026-07-04T17:18:50Z","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/0904.1058/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We propose a scheme for witnessing entanglement in phase space by significantly inefficient detectors. The implementation of this scheme does not require any additional process for correcting errors in contrast to previous proposals. Moreover, it allows us to detect entanglement without full a priori knowledge of the detection efficiency. It is shown that entanglement in single photon entangled and two-mode squeezed states can be witnessed with detection efficiency as low as 40%. Our approach enhances the possibility of witnessing entanglement in various physical systems using current detectio","authors_text":"Dieter Jaksch, Hyunseok Jeong, Seung-Woo Lee","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-04-07T06:04:45Z","title":"Witnessing entanglement in phase space using inefficient detectors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.1058","kind":"arxiv","version":3},"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":"sha256:1fec89561fd1e1edfa0dfbf68cb6d2568ad7232960b12e9b20877249002f3b3d","target":"record","created_at":"2026-07-04T17:18:50Z","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":"9e88eb7a6f278a82ef60a012e1dc25422f7d5f73d037a484e412041947195e01","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-04-07T06:04:45Z","title_canon_sha256":"392af2736ee630e9802292f8a13f52cca575ebc6e90e1653ef60144ff4dd262a"},"schema_version":"1.0","source":{"id":"0904.1058","kind":"arxiv","version":3}},"canonical_sha256":"02b94ea7496ec79064bb329a3255da8c0f0e256335b126ce2c7737ca3bcac7f7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"02b94ea7496ec79064bb329a3255da8c0f0e256335b126ce2c7737ca3bcac7f7","first_computed_at":"2026-07-04T17:18:50.422046Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:18:50.422046Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gDA8gnMLSVyAfiCiCPpfxJz5wwU02f4pjiV6addDnn6W20fcpUpP6e5H+4VkytO1bfMHuGI+79JAwzFNPanQCQ==","signature_status":"signed_v1","signed_at":"2026-07-04T17:18:50.422388Z","signed_message":"canonical_sha256_bytes"},"source_id":"0904.1058","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1fec89561fd1e1edfa0dfbf68cb6d2568ad7232960b12e9b20877249002f3b3d","sha256:6fd18521852e880580ec999c17df74485153820a5ff6718eb40981760f03f421"],"state_sha256":"df5167ac7eba75ffd64af83525c2345a9123a4a3621163522bd1e34136292738"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vU8yRibDuAGcw3u+poO90IGE+RX6j2/exEwKv6PuGGFq0CSLAgLZ/wo4jyi+Rjo5Cn9LDcPJrIRGUq6WCFeqBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T20:57:35.755836Z","bundle_sha256":"926d7ea7f64ba70150f3e67536ef3e6eeaa61c5665dbeb24df86382e5d42afd4"}}