{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2000:7PHTIBCPVIQSXE2C5LVHKZPMGC","short_pith_number":"pith:7PHTIBCP","canonical_record":{"source":{"id":"quant-ph/0003140","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2000-03-30T10:33:55Z","cross_cats_sorted":[],"title_canon_sha256":"264055336cf5f635cf8a54699ae41a3ffa444b0df898cd6003a91ed9d31cd4a4","abstract_canon_sha256":"73ecb2e6d440a7a3bea828355f5d91de68c06f487e9d58f1083c4444933f598f"},"schema_version":"1.0"},"canonical_sha256":"fbcf34044faa212b9342eaea7565ec308b51cb08d29ce886e1b5367dda11b526","source":{"kind":"arxiv","id":"quant-ph/0003140","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0003140","created_at":"2026-07-04T16:22:19Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0003140v2","created_at":"2026-07-04T16:22:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0003140","created_at":"2026-07-04T16:22:19Z"},{"alias_kind":"pith_short_12","alias_value":"7PHTIBCPVIQS","created_at":"2026-07-04T16:22:19Z"},{"alias_kind":"pith_short_16","alias_value":"7PHTIBCPVIQSXE2C","created_at":"2026-07-04T16:22:19Z"},{"alias_kind":"pith_short_8","alias_value":"7PHTIBCP","created_at":"2026-07-04T16:22:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2000:7PHTIBCPVIQSXE2C5LVHKZPMGC","target":"record","payload":{"canonical_record":{"source":{"id":"quant-ph/0003140","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2000-03-30T10:33:55Z","cross_cats_sorted":[],"title_canon_sha256":"264055336cf5f635cf8a54699ae41a3ffa444b0df898cd6003a91ed9d31cd4a4","abstract_canon_sha256":"73ecb2e6d440a7a3bea828355f5d91de68c06f487e9d58f1083c4444933f598f"},"schema_version":"1.0"},"canonical_sha256":"fbcf34044faa212b9342eaea7565ec308b51cb08d29ce886e1b5367dda11b526","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:22:19.686178Z","signature_b64":"VrEB29RDL1D5D6nXjUqWujesAJZaghoAzT7IEKwZWaJYwzGzDxfRPR33/jNeTmTf20CePZnxtXX8rywFInr8DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fbcf34044faa212b9342eaea7565ec308b51cb08d29ce886e1b5367dda11b526","last_reissued_at":"2026-07-04T16:22:19.685804Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:22:19.685804Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"quant-ph/0003140","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:22:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6PZPnE7luZojOIz86jMPe5vO6MoYLFmL9mLTRkmMpKf50nJ0Px6mpgt/PQAoKNhZcpOQshFsjUP45y0TkXvUCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T19:51:58.374889Z"},"content_sha256":"532efd44f8ebcfb710277199e10526d7698e4a0088724b12d981f0e949d30b21","schema_version":"1.0","event_id":"sha256:532efd44f8ebcfb710277199e10526d7698e4a0088724b12d981f0e949d30b21"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2000:7PHTIBCPVIQSXE2C5LVHKZPMGC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"\"Interaction-free\" discrimination between semi-transparent objects","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Graeme Mitchison, Serge Massar","submitted_at":"2000-03-30T10:33:55Z","abstract_excerpt":"Absorption-free (also known as ``interaction-free'') measurement aims to detect the presence of an opaque object using a test particle without that particle being absorbed by the object. Here we consider semi-transparent objects which have an amplitude $\\alpha$ of transmitting a particle while leaving the state of the object unchanged and an amplitude $\\beta$ of absorbing the particle. The task is to devise a protocol that can decide which of two known transmission amplitudes is present while ensuring that no particle interacts with the object. We show that the probabilities of being able to a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0003140","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/quant-ph/0003140/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":"2026-07-04T16:22:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/a15HipbDOrpWmV+u5WKRZgK1pDntUif7T231Teia1lGWryqnCarPYyk7q+rQinT4HwgS/bjK0gBPEI7tiqRAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T19:51:58.375263Z"},"content_sha256":"4137dd6e3fd65b92590e33214e6b23b72329234e8d467613cc2ce8df1c592b2f","schema_version":"1.0","event_id":"sha256:4137dd6e3fd65b92590e33214e6b23b72329234e8d467613cc2ce8df1c592b2f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7PHTIBCPVIQSXE2C5LVHKZPMGC/bundle.json","state_url":"https://pith.science/pith/7PHTIBCPVIQSXE2C5LVHKZPMGC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7PHTIBCPVIQSXE2C5LVHKZPMGC/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":"2026-08-19T19:51:58Z","links":{"resolver":"https://pith.science/pith/7PHTIBCPVIQSXE2C5LVHKZPMGC","bundle":"https://pith.science/pith/7PHTIBCPVIQSXE2C5LVHKZPMGC/bundle.json","state":"https://pith.science/pith/7PHTIBCPVIQSXE2C5LVHKZPMGC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7PHTIBCPVIQSXE2C5LVHKZPMGC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2000:7PHTIBCPVIQSXE2C5LVHKZPMGC","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":"73ecb2e6d440a7a3bea828355f5d91de68c06f487e9d58f1083c4444933f598f","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2000-03-30T10:33:55Z","title_canon_sha256":"264055336cf5f635cf8a54699ae41a3ffa444b0df898cd6003a91ed9d31cd4a4"},"schema_version":"1.0","source":{"id":"quant-ph/0003140","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0003140","created_at":"2026-07-04T16:22:19Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0003140v2","created_at":"2026-07-04T16:22:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0003140","created_at":"2026-07-04T16:22:19Z"},{"alias_kind":"pith_short_12","alias_value":"7PHTIBCPVIQS","created_at":"2026-07-04T16:22:19Z"},{"alias_kind":"pith_short_16","alias_value":"7PHTIBCPVIQSXE2C","created_at":"2026-07-04T16:22:19Z"},{"alias_kind":"pith_short_8","alias_value":"7PHTIBCP","created_at":"2026-07-04T16:22:19Z"}],"graph_snapshots":[{"event_id":"sha256:4137dd6e3fd65b92590e33214e6b23b72329234e8d467613cc2ce8df1c592b2f","target":"graph","created_at":"2026-07-04T16:22:19Z","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/0003140/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Absorption-free (also known as ``interaction-free'') measurement aims to detect the presence of an opaque object using a test particle without that particle being absorbed by the object. Here we consider semi-transparent objects which have an amplitude $\\alpha$ of transmitting a particle while leaving the state of the object unchanged and an amplitude $\\beta$ of absorbing the particle. The task is to devise a protocol that can decide which of two known transmission amplitudes is present while ensuring that no particle interacts with the object. We show that the probabilities of being able to a","authors_text":"Graeme Mitchison, Serge Massar","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"2000-03-30T10:33:55Z","title":"\"Interaction-free\" discrimination between semi-transparent objects"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0003140","kind":"arxiv","version":2},"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":"sha256:532efd44f8ebcfb710277199e10526d7698e4a0088724b12d981f0e949d30b21","target":"record","created_at":"2026-07-04T16:22:19Z","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":"73ecb2e6d440a7a3bea828355f5d91de68c06f487e9d58f1083c4444933f598f","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2000-03-30T10:33:55Z","title_canon_sha256":"264055336cf5f635cf8a54699ae41a3ffa444b0df898cd6003a91ed9d31cd4a4"},"schema_version":"1.0","source":{"id":"quant-ph/0003140","kind":"arxiv","version":2}},"canonical_sha256":"fbcf34044faa212b9342eaea7565ec308b51cb08d29ce886e1b5367dda11b526","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fbcf34044faa212b9342eaea7565ec308b51cb08d29ce886e1b5367dda11b526","first_computed_at":"2026-07-04T16:22:19.685804Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:22:19.685804Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VrEB29RDL1D5D6nXjUqWujesAJZaghoAzT7IEKwZWaJYwzGzDxfRPR33/jNeTmTf20CePZnxtXX8rywFInr8DQ==","signature_status":"signed_v1","signed_at":"2026-07-04T16:22:19.686178Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/0003140","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:532efd44f8ebcfb710277199e10526d7698e4a0088724b12d981f0e949d30b21","sha256:4137dd6e3fd65b92590e33214e6b23b72329234e8d467613cc2ce8df1c592b2f"],"state_sha256":"589d58df728c61707ddb9c78f3577d1090e5976f0f3c1a6a8ab939c909888197"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MrmZba/Ubc12acBcoRKizEzcyKm3bYEpPUh609wBL2dTmDKsjyxjdqfYhUOccb1L3TvOaIx5tKPSr2Tsb7wEBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-19T19:51:58.378593Z","bundle_sha256":"b61746ca039cbdb2067715731790d39514ff9fd9978442eb0156dbd58868e785"}}