{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:6Y4P5DXIJV7RLZ3CBOZX2V5ZTS","short_pith_number":"pith:6Y4P5DXI","canonical_record":{"source":{"id":"1006.4887","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2010-06-24T23:13:04Z","cross_cats_sorted":[],"title_canon_sha256":"89d284e2c96b6ea1e5eeccc18af21bbf9d4ebe2ffeff9cd7ce7d574d7b0f3d01","abstract_canon_sha256":"a3c7f1456d4d72f025ac096f2530eb2411449b1a2458044906faa26ced33b7f5"},"schema_version":"1.0"},"canonical_sha256":"f638fe8ee84d7f15e7620bb37d57b99caf815b984e6ee6090f6339e4581d4946","source":{"kind":"arxiv","id":"1006.4887","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1006.4887","created_at":"2026-05-18T04:15:04Z"},{"alias_kind":"arxiv_version","alias_value":"1006.4887v2","created_at":"2026-05-18T04:15:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1006.4887","created_at":"2026-05-18T04:15:04Z"},{"alias_kind":"pith_short_12","alias_value":"6Y4P5DXIJV7R","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"6Y4P5DXIJV7RLZ3C","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"6Y4P5DXI","created_at":"2026-05-18T12:26:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:6Y4P5DXIJV7RLZ3CBOZX2V5ZTS","target":"record","payload":{"canonical_record":{"source":{"id":"1006.4887","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2010-06-24T23:13:04Z","cross_cats_sorted":[],"title_canon_sha256":"89d284e2c96b6ea1e5eeccc18af21bbf9d4ebe2ffeff9cd7ce7d574d7b0f3d01","abstract_canon_sha256":"a3c7f1456d4d72f025ac096f2530eb2411449b1a2458044906faa26ced33b7f5"},"schema_version":"1.0"},"canonical_sha256":"f638fe8ee84d7f15e7620bb37d57b99caf815b984e6ee6090f6339e4581d4946","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:15:04.440577Z","signature_b64":"54CLnJwCb8Q8cl2yZRd4xW4cwobeGVHkjzpNGsutjIcwoKDWznixyOlYeElrcLDNmaNuSBtuosIGHPwBO00WDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f638fe8ee84d7f15e7620bb37d57b99caf815b984e6ee6090f6339e4581d4946","last_reissued_at":"2026-05-18T04:15:04.439835Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:15:04.439835Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1006.4887","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":"2026-05-18T04:15:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zOSgEMYBk2w0ktEFSFArYfTwSXgGKvSIYuo5eEDEDfdXxXKVonh6QDX4IkyPqdZGKVHVMGhjwtcMV76jF9IDDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T14:14:09.856030Z"},"content_sha256":"dbc6f088d5db63acf0ac6e81adc4236dbf783e01765635598d3f0d91b4be0d96","schema_version":"1.0","event_id":"sha256:dbc6f088d5db63acf0ac6e81adc4236dbf783e01765635598d3f0d91b4be0d96"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:6Y4P5DXIJV7RLZ3CBOZX2V5ZTS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Emission of photon echoes in a strongly scattering medium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"A. Ferrier, F. Beaudoux, J.-L. Le Gou\\\"et, O. Guillot-No\\\"el, Ph. Goldner, T. Chaneli\\`ere","submitted_at":"2010-06-24T23:13:04Z","abstract_excerpt":"We observe the two- and three-pulse photon echo emission from a scattering powder, obtained by grinding a Pr$^{3+}$:Y$_2$SiO$_5$ rare earth doped single crystal. We show that the collective emission is coherently constructed over several grains. A well defined atomic coherence can therefore be created between randomly placed particles. Observation of photon echo on powders as opposed to bulk materials opens the way to faster material development. More generally, time-domain resonant four-wave mixing offers an attractive approach to investigate coherent propagation in scattering media."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1006.4887","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":""},"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":"2026-05-18T04:15:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N0NfkJ8dB6a0Rlwdw9ExAt5Jb7GtxOeIMCnOSYZYc5mihKF6FzntX5OyqI2dFSRDrjCi6NarTDHUBEK4vbwbCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T14:14:09.856472Z"},"content_sha256":"86236edee39405608b77725394edccccc10f11d259fb7dcb3bcc26dd23612822","schema_version":"1.0","event_id":"sha256:86236edee39405608b77725394edccccc10f11d259fb7dcb3bcc26dd23612822"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6Y4P5DXIJV7RLZ3CBOZX2V5ZTS/bundle.json","state_url":"https://pith.science/pith/6Y4P5DXIJV7RLZ3CBOZX2V5ZTS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6Y4P5DXIJV7RLZ3CBOZX2V5ZTS/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":"2026-05-27T14:14:09Z","links":{"resolver":"https://pith.science/pith/6Y4P5DXIJV7RLZ3CBOZX2V5ZTS","bundle":"https://pith.science/pith/6Y4P5DXIJV7RLZ3CBOZX2V5ZTS/bundle.json","state":"https://pith.science/pith/6Y4P5DXIJV7RLZ3CBOZX2V5ZTS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6Y4P5DXIJV7RLZ3CBOZX2V5ZTS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:6Y4P5DXIJV7RLZ3CBOZX2V5ZTS","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":"a3c7f1456d4d72f025ac096f2530eb2411449b1a2458044906faa26ced33b7f5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2010-06-24T23:13:04Z","title_canon_sha256":"89d284e2c96b6ea1e5eeccc18af21bbf9d4ebe2ffeff9cd7ce7d574d7b0f3d01"},"schema_version":"1.0","source":{"id":"1006.4887","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1006.4887","created_at":"2026-05-18T04:15:04Z"},{"alias_kind":"arxiv_version","alias_value":"1006.4887v2","created_at":"2026-05-18T04:15:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1006.4887","created_at":"2026-05-18T04:15:04Z"},{"alias_kind":"pith_short_12","alias_value":"6Y4P5DXIJV7R","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"6Y4P5DXIJV7RLZ3C","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"6Y4P5DXI","created_at":"2026-05-18T12:26:04Z"}],"graph_snapshots":[{"event_id":"sha256:86236edee39405608b77725394edccccc10f11d259fb7dcb3bcc26dd23612822","target":"graph","created_at":"2026-05-18T04:15:04Z","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 observe the two- and three-pulse photon echo emission from a scattering powder, obtained by grinding a Pr$^{3+}$:Y$_2$SiO$_5$ rare earth doped single crystal. We show that the collective emission is coherently constructed over several grains. A well defined atomic coherence can therefore be created between randomly placed particles. Observation of photon echo on powders as opposed to bulk materials opens the way to faster material development. More generally, time-domain resonant four-wave mixing offers an attractive approach to investigate coherent propagation in scattering media.","authors_text":"A. Ferrier, F. Beaudoux, J.-L. Le Gou\\\"et, O. Guillot-No\\\"el, Ph. Goldner, T. Chaneli\\`ere","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2010-06-24T23:13:04Z","title":"Emission of photon echoes in a strongly scattering medium"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1006.4887","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:dbc6f088d5db63acf0ac6e81adc4236dbf783e01765635598d3f0d91b4be0d96","target":"record","created_at":"2026-05-18T04:15:04Z","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":"a3c7f1456d4d72f025ac096f2530eb2411449b1a2458044906faa26ced33b7f5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2010-06-24T23:13:04Z","title_canon_sha256":"89d284e2c96b6ea1e5eeccc18af21bbf9d4ebe2ffeff9cd7ce7d574d7b0f3d01"},"schema_version":"1.0","source":{"id":"1006.4887","kind":"arxiv","version":2}},"canonical_sha256":"f638fe8ee84d7f15e7620bb37d57b99caf815b984e6ee6090f6339e4581d4946","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f638fe8ee84d7f15e7620bb37d57b99caf815b984e6ee6090f6339e4581d4946","first_computed_at":"2026-05-18T04:15:04.439835Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:15:04.439835Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"54CLnJwCb8Q8cl2yZRd4xW4cwobeGVHkjzpNGsutjIcwoKDWznixyOlYeElrcLDNmaNuSBtuosIGHPwBO00WDA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:15:04.440577Z","signed_message":"canonical_sha256_bytes"},"source_id":"1006.4887","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dbc6f088d5db63acf0ac6e81adc4236dbf783e01765635598d3f0d91b4be0d96","sha256:86236edee39405608b77725394edccccc10f11d259fb7dcb3bcc26dd23612822"],"state_sha256":"eff516fac910bdfd7962177bbb76a2b6110088d8ae07a65f47b408261c32cf62"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OFUVn5JyKBV/ojQ9iNCbXOdcANP4IDR1NK3K6rUkMMjvdamK2aWmsxAGtJKvXpkozpT2EHenOecmlApo67+zCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T14:14:09.859256Z","bundle_sha256":"63bcb8d4196a5ea4ff6f4dcf69cd70c29c8b999a4d726d589126f1372d8eb555"}}